A long-standing enigma surrounding the Crab Pulsar, a neutron star at the center of the Crab Nebula, may have been unraveled by a theoretical astrophysicist from the University of Kansas.&nbsp;



The study, led by Professor Mikhail Medvedev and recently published in the journal <a href="https://dx.doi.org/10.1103/PhysRevLett.133.205201" target="_blank" rel="noreferrer noopener">Physical Review Letters</a>, explains the origins of the pulsar’s unique “zebra” pattern, a peculiar banding in high-frequency radio waves.



<h2 class="wp-block-heading" id="h-powerful-emission-from-the-crab-nebula">Powerful emission from the Crab Nebula</h2>



At the heart of the Crab Nebula, 6,000 light years from Earth, lies the Crab Pulsar, a 12-mile-wide neutron star emitting powerful electromagnetic radiation.



“The emission, which resembles a lighthouse beam, repeatedly sweeps past Earth as the star rotates,” said Medvedev, professor of physics and astronomy at the <a href="https://www.ku.edu/" target="_blank" rel="noreferrer noopener">University of Kansas</a>.&nbsp;



“We observe this as a pulsed emission, usually with one or two pulses per rotation. The specific <a href="https://www.earth.com/news/pulsars-are-helping-astronomers-pinpoint-dark-matter/" target="_blank" rel="noreferrer noopener">pulsar</a> I'm discussing is known as the Crab Pulsar.”



<h2 class="wp-block-heading" id="h-zebra-pattern-in-the-crab-nebula">Zebra pattern in the Crab Nebula</h2>



The <a href="https://www.earth.com/news/unraveling-the-mysterious-origins-of-the-crab-nebula/" target="_blank" rel="noreferrer noopener">nebula</a> itself is the remnant of a supernova documented in 1054, with historical records from China describing an unusually bright star in the sky.&nbsp;



However, unlike other pulsars, the Crab Pulsar exhibits a zebra pattern in its high-frequency emissions, making it a singular case in the study of neutron stars.



“This is the only object we know of that produces the zebra pattern, and it only appears in a single emission component from the Crab Pulsar,” Medvedev noted.



<h2 class="wp-block-heading" id="h-a-puzzle-decades-in-the-making">A puzzle decades in the making</h2>



Since its discovery in 2007, the zebra pattern has stymied researchers. The band spacing in its electromagnetic spectrum, along with its high polarization and stability, defied explanation.&nbsp;



“Researchers proposed various emission mechanisms, but none have convincingly explained the observed patterns,” said Medvedev.



The zebra pattern occurs within the pulsar’s high-frequency interpulse, a range between 5 and 30 gigahertz - frequencies akin to those of a microwave oven. Using innovative techniques, Medvedev’s research links the phenomenon to the plasma surrounding the pulsar.



<h2 class="wp-block-heading" id="h-decoding-the-crab-nebula-s-zebra-pattern">Decoding the Crab Nebula's zebra pattern </h2>



Medvedev’s breakthrough came from studying the Crab Pulsar’s <a href="https://www.earth.com/news/secrets-of-jupiters-magnetosphere-will-help-us-predict-space-weather/" target="_blank" rel="noreferrer noopener">magnetosphere</a>, a region filled with plasma composed of charged particles like electrons and positrons.&nbsp;



By applying wave optics, Medvedev connected the zebra pattern in the Crab Nebula to diffraction effects caused by the pulsar’s plasma.



“If you have a screen and an electromagnetic wave passes by, the wave doesn’t propagate straight through,” Medvedev explained.&nbsp;



“Wave optics introduces a different behavior - waves bend around obstacles and interfere with each other, creating a sequence of bright and dim fringes due to constructive and destructive interference.”



<h2 class="wp-block-heading" id="h-plasma-diffraction-patterns-in-the-crab-pulsar">Plasma diffraction patterns in the Crab Pulsar </h2>



In the Crab Pulsar, these diffraction patterns vary based on the plasma’s density and the radio wave’s frequency.



“A typical diffraction pattern would produce evenly spaced fringes if we just had a neutron star as a shield,” Medvedev said. “But here, the <a href="https://www.earth.com/news/neutron-stars-may-hold-the-key-to-understanding-dark-matter/" target="_blank" rel="noreferrer noopener">neutron star</a>’s magnetic field generates charged particles constituting a dense plasma, which varies with distance from the star.”&nbsp;



“Low frequencies reflect at large radii, casting a bigger shadow, while high frequencies create smaller shadows, resulting in different fringe spacing.”



This plasma diffraction creates the zebra pattern, with the fringe spacing reflecting variations in the density of the plasma.



<h2 class="wp-block-heading" id="h-mapping-the-pulsar-s-magnetosphere">Mapping the pulsar’s magnetosphere</h2>



“This model is the first one capable of measuring those parameters,” Medvedev said. “By analyzing the fringes, we can deduce the density and distribution of plasma in the magnetosphere.”&nbsp;



“It’s incredible because these observations allow us to convert fringe measurements into a density distribution of the plasma, essentially creating an image or performing tomography of the neutron star’s magnetosphere.”



Medvedev’s findings not only clarify the zebra pattern but also open the door to understanding the intricate structure of the Crab Pulsar’s plasma environment.



<h2 class="wp-block-heading" id="h-implications-for-future-research">Implications for future research</h2>



The study provides a framework for further investigation of the Crab Pulsar and other neutron stars. With additional data collection and refinements to account for gravitational and polarization effects, the method could yield insights into other young and energetic pulsars.



“The Crab Pulsar is somewhat unique - it’s relatively young by astronomical standards, only about a thousand years old, and highly energetic,” Medvedev said. “But it’s not alone; we know of hundreds of pulsars, with over a dozen that are also young.”



The method may even be applied to binary pulsars, which were instrumental in confirming Einstein’s theory of general relativity. “Known binary pulsars can also be explored with the proposed method,” Medvedev added.&nbsp;



“This research can indeed broaden our understanding and observation techniques for pulsars, particularly young, energetic ones.”



<h2 class="wp-block-heading" id="h-a-leap-forward-in-astrophysics">A leap forward in astrophysics</h2>



By identifying the role of plasma diffraction in the Crab Pulsar’s zebra pattern, Medvedev’s work bridges a critical gap in astrophysics.&nbsp;



The study not only explains a unique phenomenon but also establishes a technique for probing the magnetospheres of pulsars, advancing our understanding of these extraordinary objects.



Image Credit: NASA, ESA, J. Hester and A. Loll (Arizona State University)



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Mysterious signals from Crab Nebula form a zebra pattern

A long-standing enigma surrounding the Crab Pulsar, a neutron star at the center of the Crab Nebula, may have been unraveled by a theoretical astrophysicist from the University of Kansas.&nbsp; The study, led by Professor Mikhail Medvedev and recently published in the journal Physical Review Letters, explains the origins of the pulsar’s unique “zebra” pattern, a peculiar banding in high-frequency radio waves. Powerful emission from the Crab Nebula At the heart of the Crab Nebula, 6,000 light years from Earth, lies the Crab Pulsar, a 12-mile-wide neutron...

<div>Collecting DNA from rivers uncovers biodiversity Collecting DNA from rivers uncovers biodiversity Most natural ecosystems are heavily affected by changes to the human habitat, climate change or invasive species. In order to protect these ecosystems, one needs to know which organisms live in them. Therefore, assessing the state of and change in biodiversity is central to ecology and conservation biology. However, classical methods are often only suitable for determining a subset of <a href="http://www.earth.com/news/coastal-mud-cool-climate/">organisms</a>. Moreover, they are expensive and involve collecting the organisms themselves.</div>
<div>

Recently, scientists came up with the idea of collecting the <a href="https://en.wikipedia.org/wiki/Biomass">DNA</a> of organisms from environmental samples instead, such as soil or water, and determining the various species that way. All organisms constantly shed DNA into the environment, such as via feces or skin particles. This environmental DNA is sequenced using state-of-the-art technology and subsequently matched with databases to determine the species. "This completely novel approach has the potential to revolutionize the study of biodiversity," says Florian Altermatt, a professor at the Department of Evolutionary Biology and Environmental Studies at the University of Zurich and the Swiss Federal Institute of Aquatic Science and Technology (Eawag).

[caption id="attachment_2413431" align="alignleft" width="150"]<img class="size-thumbnail wp-image-2413431" src="http://cff1.greenatom.earth/uploads/2016/08/30101726/cff1.greenatom.earthuploads20160830101725media.eurekalert.orgmultimedia_prodpubweb122870_web-a22d4860565dc1e534432c0f881040972e7d301a-7cb7a8dcc373f60548cb41abca9acb002bffdf03-150x150.jpg" alt="extracting DNA from river water" width="150" height="150" /> extracting DNA from river water[/caption]

NA from mayflies and beavers

Altermatt and his team at Eawag in Dübendorf recently provided practical evidence of this idea by collecting water at various points in the Glatt, a river in the Canton of Zurich, and subsequently extracting all the DNA. "We collected a liter of water, which meant we could extract DNA from a staggering number of species, from aquatic insects, such as mayflies, to the beaver who lives further upstream," explains study coordinator Altermatt. DNA from thousands of organisms was compared with traditional estimates of biodiversity. This confirmed that the organisms detected actually live in this environment.

In previous studies, the authors had already demonstrated that rivers transport DNA for several kilometers. "This opens up completely novel approaches to collect information on the diversity of organisms in river systems," says Altermatt. "We can now potentially determine biodiversity in a similar way to the chemistry of the water." Not only do the individual water samples contain information on aquatic organisms, but also land organisms found along the river. Consequently, the scientists gained a fingerprint of the organisms living in entire catchment areas and demonstrate the potential of environmental DNA for determining the biodiversity of all animals, from aquatic insects to mammals.

Routinely determining biodiversity

The study conducted by the UZH researchers reveals that, through their unique network structure, rivers collect and transport DNA containing information on the organisms in the water and on land. As the method can be automated, it might be possible to obtain data on biodiversity in an unprecedented spatial and temporal resolution in the future. "I could imagine that the water samples currently taken by cantonal or federal authorities on a daily or even hourly basis for chemical screening could also be used to record biodiversity," speculates Altermatt.

Literature:

Kristy Deiner, Emanuel A. Fronhofer, Elvira Mächler, Jean-Claude Walser and Florian Altermatt. Environmental DNA reveals that rivers are conveyer belts of biodiversity information. Nature Communications. August 30, 2016. Doi: 10.1038/ncomms12544

Contacts:

Prof. Florian Altermatt
Department of Evolutionary Biology and Environmental Studies
University of Zurich
Phone: +41 58 765 55 92 / +41 79 222 98 10
E-mail: <a href="mailto:florian.altermatt@ieu.uzh.ch">florian.altermatt@ieu.uzh.ch</a>

Media Relations
University of Zurich
Phone: +41 44 634 44 32
E-mail: <a href="mailto:mediarelations@kommunikation.uzh.ch">mediarelations@kommunikation.uzh.ch</a>

</div>

Collecting DNA from rivers uncovers biodiversity

Collecting DNA from rivers uncovers biodiversity Collecting DNA from rivers...

<div>Study: Banning high seas fishing would help coastal fishermen Closing the high seas to fishing could increase fish catches in coastal waters by 10 per cent, helping people, especially the most vulnerable, cope with the expected losses of fish due to climate change, new UBC research finds. Study: Banning high seas fishing would help coastal fishermen</div>
<div>

"Many important fish stocks live in both the high seas and coastal waters. Effective management of high seas fisheries could benefit coastal waters in terms of productivity and help reduce climate change impacts," said lead author William Cheung, associate professor and director of science of the Nippon Foundation-Nereus Program at UBC's Institute for the Oceans and Fisheries. Study: Banning high seas fishing would help coastal fishermen

The high seas are areas of ocean outside the jurisdiction of any country and cover nearly two-thirds of the ocean's surface.

Researchers used computer models to predict catches of 30 important <a href="http://www.earth.com/news/fish-feel-pain/">fish</a> that live in both the high seas and coastal waters stocks in 2050 under three different management scenarios: closing the high seas to fishing, international cooperation to manage fishing, and maintaining the status quo.

They found that both strengthening governance and closing the high seas to fishing increased the resilience of coastal countries to climate change, especially in tropical countries where there is a high dependence on fisheries for food and livelihood.

"The scenarios of closing the high seas may greatly reduce the issue of inequity of benefits and impacts among different countries under climate change," said co-author Vicky Lam, a postdoctoral fellow at UBC's Institute for the Oceans and Fisheries.

Climate change is expected to disproportionately impact countries in the South Pacific, Indo-Pacific, West African coast and west coast of central America. Previous UBC research shows that if carbon dioxide levels continue to rise on the current trajectory and the Earth warms, these countries could face a 30 per cent decrease in fish stocks as fish migrate to cooler waters.

"The high seas can serve as a fish bank of the world by providing the insurance needed to make the whole global ocean more resilient," said paper co-author Rashid Sumaila, professor at UBC's Institute for the Oceans and Fisheries and director of OceanCanada, one of the research funders. "By closing the high seas to fishing or seriously improving its management, the high seas can help us mitigate and adapt to the effects of climate change on marine ecosystems."

The study was published today in Fish and Fisheries.
###
About the Nippon Foundation Nereus Program

The Nereus Program, a collaboration between the Nippon Foundation and the University of British Columbia Institute for the Oceans and Fisheries, has engaged in innovative, interdisciplinary ocean research since its inception in 2011. The program is currently a global partnership of six leading marine science institutes with the aim of undertaking research that advances our comprehensive understandings of the global ocean systems across the natural and social sciences, from oceanography and marine ecology to fisheries economics and impacts on coastal communities. Visit <a href="http://nereusprogram.org/" target="_blank" rel="noopener noreferrer">nereusprogram.org</a> for more information.

This research was supported by the Nippon Foundation, the Natural Sciences and Engineering Research Council of Canada, and the Social Sciences and Humanity Research Council of Canada through the OceanCanada partnership grant project.

</div>

Study: Banning high seas fishing would help coastal fishermen

Study: Banning high seas fishing would help coastal fishermen Closing...

New map shows where climate change will force animals to move. Scientists predict that as Earth warms and climate change patterns morph in response, animals will be forced to move to survive. That usually means hightailing it to higher latitudes as equatorial areas become too hot and dry.

This movement pattern has happened fluidly and naturally in the past as climates have shifted, but now with human developments such as cities, highways and agriculture, critical animal migrations will be limited in surprising and troubling ways.New map shows where climate change will force animals to move

The University of <a href="http://www.earth.com/image/mount-rainier-in-washington/">Washington</a> and The Nature Conservancy have created an animated map showing where mammals, birds and amphibians are projected to move in the Western Hemisphere in response to climate change. The visualization draws upon flow models from electronic circuit theory, taking inspiration from existing visualizations of wind flow across the U.S.

“This is the best visualization of any of these studies we’ve done. It’s much more compelling than our static maps,” said Joshua Lawler, a UW professor in the School of Environmental and Forest Sciences and lead author of the study informing this animated map. “The flow diagram really makes the data much more accessible.”

In 2013 Lawler, along with Julian Olden, a UW associate professor of aquatic and fishery sciences, then UW graduate student Aaron Ruesch and Brad McRae of the Conservancy, published a landmark study in Ecology Letters that considered the likely movement patterns of nearly 3,000 species under climate change — determining which areas will be hot spots for animal migration in the coming decades and centuries.

<a href="http://www.washington.edu/news/files/2016/08/igrations-in-Motion-The-Nature-Conservancy20160826122035.gif" target="_blank" rel="noopener noreferrer">http://www.washington.edu/news/files/2016/08/igrations-in-Motion-The-Nature-Conservancy20160826122035.gif</a>

<a href="http://www.washington.edu/news/files/2016/08/igrations-in-Motion-The-Nature-Conservancy201608261150171.gif" target="_blank" rel="noopener noreferrer">http://www.washington.edu/news/files/2016/08/igrations-in-Motion-The-Nature-Conservancy201608261150171.gif</a>

In the U.S., they predict that the Appalachians will likely serve as a highway for species moving north. In the west, mountain ranges and protected areas will also serve as conduits, but many of the higher mountains will also serve as refuges themselves.

The researchers had created fixed maps showing species’ movement and patterns, but the data practically begged to be animated to visualize the full effect of the paper’s results, Lawler said. They asked data whiz Dan Majka with the Conservancy’s science team to produce an animation, and in mid-August Migrations in Motion launched.

The map is color-coded to depict separate movement patterns for mammals, birds and amphibians. The animations show a mass exodus toward northern regions, with empty black zones showing where large cities or landscape features like the Great Lakes block migration. It’s important to note that each dot and subsequent streaking line show the accumulation of species’ movement, not just one animal’s future migration, Lawler explained.

The researchers were surprised to see how clearly migration routes appeared once the data were visualized. They knew from the data that the Appalachians and the Rocky Mountains were important movement areas, but once the data were animated on a map, those routes popped out like well-trodden paths, Lawler said.

“It was shocking to see these features emerge so clearly. You can really see them when the data are visualized like this,” he said.

In South America, the most striking pattern is a projected movement of species west out of the Amazon, Lawler added.

The researchers plan to calculate migration shifts for species in the U.S., particularly in the western regions, at finer resolutions, then apply that information to find the places most important to protect for movement under climate change. They also hope to visualize that data.

Read more about Migrations in Motion on the Conservancy’s blog, and see related stories in Wired, The Atlantic’s CityLab and Fast Company.

---

<a href="http://www.washington.edu" target="_blank" rel="noopener noreferrer">University of Washington</a>

New map shows where climate change will force animals to move

New map shows where climate change will force animals to...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Nushagak Bay, a large estuary in southwest Alaska. Nushagak runs mainly north to south and exits in Bristol Bay, a large body of water in the Bering Sea.



"The bay is primarily fed by the Nushagak River, which begins in the Alaska Range and flows southwest approximately 450 km. The bay is also fed by several additional rivers including the Wood, Igushik, Snake and Weary rivers," says ESA.



"The dark colors of the Nushagak River are most likely due to tannins or lignins (chemical substances found in plants). Tannins and lignins from roots, leaves, seeds, bark and soil can leach into the water and give it a brown or even black colour. The sediments then flow southwards where it is mixed with the bluer waters of the bay."



Video/ Image Credit: ESA



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Nushagak Bay in southwest Alaska

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



"The main antigenic targets of influenza virus are two surface glycoproteins, hemagglutinin (HA) and neuraminidase (NA). Whereas the structural and dynamical properties of both glycoproteins have been studied previously, the understanding of their plasticity in the whole-virion context is fragmented," wrote the researchers.



To investigate, the team conducted detailed simulations of the influenza A H1N1 virion, or the swine flu. The experts concluded that the visualizations show many new vulnerable states of flu viruses, which could improve future vaccines and antiviral drugs.



Video/ Image Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Flu viruses are more flexible than expected

[sendtonews key="G9bUoxcjr4-2511624-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lake Trasimeno, which is located west of Perugia in central Italy. It is the fourth largest lake in the country. While Trasimeno’s water level varies, it has a maximum depth of approximately six meters.&nbsp;



"In this Copernicus Sentinel-2 image, captured on 6 August 2022, the lake’s emerald green colour is likely due to the presence of phytoplankton. Streaks in the water, particularly visible in the west, indicate the presence of soil and sediments which have been stirred up by winds. Dark colored waters in the southern part of the lake indicate a presence of submerged and floating macrophytes (aquatic plants) as well as algae," says ESA.



"Surrounded by hills on three sides, Trasimeno is subject to heavy storms created by winds, especially from the north and west. There are three islets in the lake: Maggiore, Minore and Polvese (the largest). The lake’s shores are sparsely inhabited with only two popular villages: Castiglione del Lago and Passignano sul Trasimeno."



"Italy is experiencing its worst drought in 70 years which has affected drinking water supplies, hydroelectric power and agricultural production. High temperatures, hot winds and lack of rainfall are the main causes of drought in the Umbrian region which saw Lake Trasimeno’s drop 1.3 m, reaching the limit of the hydrometric zero in July 2022."



Video/Image Credit: ESA&nbsp;



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Lake Trasimeno in Central Italy

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes a new self-powered nanosensor that can instantly detect mercury contamination with the tap of a finger.&nbsp;



The oxidized form of mercury can be harmful when it is ingested through contaminated water or food. This makes it necessary for experts to develop sensors that can quickly and accurately detect the presence of mercury.&nbsp;



Zong-Hong Lin and colleagues have now created a triboelectric nanosensor (TENS) that can detect mercury by simply by touching a sample. According to the researchers, their TENS could serve as the basis for similar devices to safely and remotely monitor other pollutants.



Video Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Detecting mercury contamination with the tap of a finger

[sendtonews key="LvS8v8bp9z-2564889-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Kainji Lake, a reservoir on the Niger River.



In 1968, Kainji Lake was created by the construction of the Kainji Dam. The Niger River, the third longest in Africa, enters the lake in the north.&nbsp;



According to <a href="https://www.earth.com/news/rivers-in-the-american-west-are-a-lifesaving-resource-for-birds/">ESA</a>, the creation of the lake submerged Foge Island and the town of Bussa and permanently flooded other riverine settlements, leaving around 50,000 people displaced.&nbsp;



Large parts of Foge Island are temporarily exposed during low water tides, and the land is often used by migrating fishermen. Kainji Dam is a dam across the Niger River in Niger State of Central Nigeria. 



Wild mammals occur at relatively low densities due to illegal hunting. Lake Kainji has suffered a dramatic decline as a fishery due to the high numbers of artisanal and subsistence fisherfolk using the lake. It has been suggested that a period of closure, together with controlled fishing rights may help improve fish stocks.



Kainji Lake National Park is the oldest of its kind in Nigeria. The park contains three distinct areas: a part of the Kainji Lake, the Borgu Game Reserve to the west of the lake, and the Zugurma Game Reserve to the southeast. The park is home to around 65 mammal species, 350 bird species, and 30 species of reptiles and amphibians. 



Video/ Image Credit: European Space Agency&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Kainji Lake in north central Nigeria

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Today’s Video of the Day from <a href="https://www.igb.illinois.edu/">Carl R. Woese Institute for Genomic Biology</a> reveals how scientists can modify common crops like soybean, rice, and wheat to protect them from heat stress.



“We need to double crop production by 2050 to feed a growing global population, and not only are we not on track to do that, but climate change is further complicating things,” said Amanda Cavanagh, a lecturer at the University of Essex. 



The study is part of Realizing Increased Photosynthetic Efficiency (RIPE), an international research project that aims to develop food crops that turn the sun’s energy into food more efficiently.



“Using an engineering approach we designed multiple alternative metabolic pathways to photorespiration. Testing them in the field showed increases in productivity which led Amanda to significantly move the project forward by showing our engineered plants can withstand pretty extreme temperature stress,” said study co-author and RIPE researcher Paul South.&nbsp;



“As the climate changes and temperature stresses increase the pressure on our global food supply, farmers will need every tool available including engineering approaches like the synthetic biology used here to maintain safe and productive harvests.”



The experts tested plants modified to have more efficient photorespiration to see if they were better adapted to warmer temperatures.&nbsp;



The team found that the engineered plants produced 26 percent more biomass than the wild-type plants exposed to the same temperatures, and had 15 percent less yield loss under the higher temperatures.



Video Credit: Amanda Nguyen/University of Illinois



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Designing crops that can beat the heat

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Today’s Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> explores the ability of salt to transform the way that foods and beverages taste. Salt is known to cover up undesirable flavors, such as bitterness in coffee or beer, but how exactly does sodium chloride change the taste of other compounds?



One previous study showed that, not only does salt suppress bitterness, but also enhances sweetness and sourness. Another study revealed that bitterness reduction by salt seems to be happening at the tongue receptor level as well as in the brain.&nbsp;



While it is known that salt taste is mediated by the presence of sodium channels in the form of taste buds, experts believe that there is also an unknown receptor responsible for how we taste salt that has not yet been identified.&nbsp;



Video Credit: ACS Reactions



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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How does salt makes things taste better?

[sendtonews key="X0f6OHYoI4-2310561-12187" type="single"] Today’s Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Santiago, the capital city of Chile. The city is located in the center of the Santiago Metropolitan Region, which has a population of about eight million people.&nbsp;



'The weather of Santiago resembles the Mediterranean climate with dry and warm summers with temperatures reaching up to 35°C (from October to March) and cool and humid winters that can drop to 0°C (from April to September)."



"The city lies in the centre of the country’s central valley around 80 km from the Pacific Ocean to the west and borders Argentina to the east. A tiny part of Argentina is visible in the top-right corner of the image where the mountain crest of the Andes Mountains acts as a divider between the two countries," says ESA.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Santiago, Chile in South America

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Spiral,Galaxy,,Illustration,Of,Milky,Way

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Astronomers at <a href="https://www.jhu.edu/">Johns Hopkins University</a> have created an interactive map of the universe, including the actual position and real colors of 200,000 galaxies. The map allows the public to access data that was previously only available to scientists.



The map was developed using data collected by the Sloan Digital Sky Survey. For over two decades, a telescope in New Mexico was aimed at slightly different locations to capture the night sky.&nbsp;



"Growing up I was very inspired by astronomy pictures, stars, nebulae and galaxies, and now it's our time to create a new type of picture to inspire people," said map creator Brice Ménard, a professor at Johns Hopkins. "Astrophysicists around the world have been analyzing this data for years, leading to thousands of scientific papers and discoveries. But nobody took the time to create a map that is beautiful, scientifically accurate, and accessible to people who are not scientists. Our goal here is to show everybody what the universe really looks like."



"In this map, we are just a speck at the very bottom, just one pixel. And when I say we, I mean our galaxy, the Milky Way which has billions of stars and planets. We are used to seeing astronomical pictures showing one galaxy here, one galaxy there or perhaps a group of galaxies. But what this map shows is a very, very different scale."



"From this speck at the bottom, we are able to map out galaxies across the entire universe, and that says something about the power of science."



The <a href="https://mapoftheuniverse.net/">interactive map</a> is available online, where it can be downloaded for free.



Video Credit: Johns Hopkins&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Interactive map of the universe includes 200,000 galaxies

[sendtonews key="e4ZG0Jawp3-2374785-12187" type="single"] Astronomers at Johns Hopkins University have created...

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes the first comprehensive estimate of carbon density in the Saharan, Sahel, and Sudanian zones of Africa. In an effort to measure the amount of carbon stored across these drylands, a team of scientists used high-resolution satellite images and artificial intelligence to map nearly 10 billion individual trees. 



"The high spatial resolution (50 cm) combined with AI and field measurements used in this study is key to improving tree inventories in drylands," said Pierre Hiernaux, a French researcher working for NASA. "The ever-increasing availability of very high-resolution satellite imagery will make it possible to assess carbon pools and their dynamics at the individual tree level on a global scale."



"This study is exceptional because it is pioneering a type of approach that will revolutionize the monitoring of trees and forests on a global scale: in the short term, it will be possible to map the world's trees from the centre of the Amazon to our schoolyards," said <a href="https://www.inrae.fr/en">INRAE</a> researcher Jean-Pierre Wigneron.



"Many fields of application will become much more efficient and accurate, such as tracking carbon stocks, biodiversity, monitoring logging and protection against illegal forest degradation, in near real time.”



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Remote sensing will revolutionize the way we monitor trees

[sendtonews key="EjmSP20gQK-2593093-12187" type="single"] Today's Video of the Day from NASA...

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Dublin, the capital and largest city of Ireland. Beyond its pub culture, Dublin is known as a modern culinary destination and a UNESCO City of Literature.



"Dublin is located near the midpoint of Ireland’s east coast in the province of Leinster. The city, which covers an area of around 115 square kilometers, is bordered by the Dublin Mountains, a low mountain range to the south, and is surrounded by flat farmland to the north and west," says ESA.



"The city straddles the River Liffey, which rises in the Wicklow Mountains and flows around 80 kilometers eastwards through the city of Dublin, in which it is canalised and bordered with quays. It then empties into Dublin Bay, an arm of the Irish Sea."



Dublin has an abundance of green spaces, including one of the largest enclosed public parks in any European capital city. Phoenix Park, which was originally formed as a royal hunting park in the 1660s, includes 707 hectares of green space.



Video Credit: ESA&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The city of Dublin on Ireland's east coast

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the province of Zaragoza in northeast Spain. The image was captured by the Copernicus Sentinel-2 mission.



"Together with the provinces of Huesca and Teruel, Zaragoza formed the old kingdom of Aragon. Its capital, also called Zaragoza (not visible in this image) is home to around half of Aragon’s population," says ESA.



"The Ebro River can be seen winding its way through the province from west to east in this image. Between its source in the Cantabrian Mountains in the northwest and its delta on the Mediterranean coast, the Ebro River is fed by more than 200 tributaries as it flows 910 km across much of northern Spain."



Since rainfall is very scarce in this region, irrigation in the Ebro basin is critically important. In the valleys surrounding the Ebro River, many fields are used for growing crops such as corn, wheat, and barley.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The province of Zaragoza in northeast Spain

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> features a visual dataset of.methane emissions from wetlands across the globe. Atmospheric methane levels have reached record highs in recent years, and wetlands are a major source of these emissions.&nbsp;



"Methane is an important greenhouse gas that contributes substantially to global warming. On a molecule by molecule basis, methane is much more efficient at trapping heat than carbon dioxide, the main driver of warming," says NASA.



"Though human activities, including agriculture, oil and natural gas production and use, and waste disposal, collectively contribute the majority of methane to the atmosphere, about a third of total methane emissions comes from wetlands."&nbsp;



According to NASA, understanding methane emissions from wetlands and other natural sources is critically important for scientists and policymakers who are working to combat climate change by reducing emissions from human activities.



Video Credit: NASA Goddard



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Wetlands are a major source of methane emissions

[sendtonews key="f8fukm28Vz-2491833-12187" type="single"] Today's Video of the Day from NASA...

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> reveals the evolution of the Columbia Glacier in southeastern Alaska. Columbia is among the fastest shrinking glaciers in the world, and the video documents its rapid retreat over the years.&nbsp;



Columbia Glacier is a large, multi-branched calving glacier that flows out of the Chugach Mountains to the Prince William Sound.&nbsp;



According to USGS, Columbia had a long history of stability prior to 1980, with a length 41 miles, and small, short-lived advances or retreats.



In the years since 1980, however, satellite images have captured Columbia’s alarming retreat. By using false-color images, scientists can distinguish between snow and ice, open water, vegetation, and rocky debris on the glacier’s surface.



The series of false-color images featured in today's video were acquired over the span of 35 years. You can see that by 2021, the glacier’s main branch had retreated about 15 miles from its initial position.



The Columbia Glacier has also lost more than 50 percent of its volume, mostly due to calving. <a href="https://www.earth.com/video/nasa-reveals-3d-visual-of-an-atmospheric-river/">NASA</a> reports that while climate change likely started the retreat, mechanical processes kept the disintegration going.



The NASA images are provided by Jesse Allen, Robert Simmon, Joshua Stevens, and Lauren Dauphin using data from Landsat satellites, from the U.S. Geological Survey, and data from MODIS on NASA’s Terra satellite. The structure of Columbia’s moraine played a large role in the stability of the glacier before 1980. 



Like other tidewater glaciers, the Columbia built up a moraine over time, and the mixture of ice and rock functioned like a dam keeping out the sea. It was supported on one end by the shoreline and by the underwater terminal moraine at the other.



Video Credit: NASA Earth Observatory/&nbsp; NASA’s Scientific Visualization Studio



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The rapid retreat of the Columbia Glacier

[sendtonews key="0879czfG3k-1785905-12187" type="single"] Today’s Video of the Day from NASA...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the Pyrenees Mountains, which form a natural boundary between France and Spain in southwest Europe.



The mountain range is 430 kilometers in length. It stretches from the Mediterranean Sea on the east to the Atlantic Ocean on the west.



At an elevation of 3404 meters, Pico de Aneto is the highest mountain peak in the Pyrenees, and the third-highest peak in Spain. Pico de Aneto is located in the Posets-Maladeta Natural Park, which spans more than 82,000 acres.&nbsp;



"Geological studies have revealed that the Pyrenees Mountains have been around for longer than the Alps, with their sediments first deposited in coastal basins during the Paleozoic and Mesozoic eras," reports ESA.



"The entire mountain range formed due to the upwelling of large sedimentary rocks by the collision of the Iberian and the Eurasian plate around 100 to 150 million years ago, followed by intense erosion from ice and water."



The western Pyrenees receive more precipitation due to moisture blowing in from the Atlantic Ocean. The mountain range contains many lakes, several small glaciers, and some of the highest waterfalls in Europe.



Video &amp; Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The Pyrenees Mountains in southwest Europe

[sendtonews key="6HyfrAJTBI-1831843-12187" type="single"] Today’s Video of the Day from the...

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Today’s Video of the Day from <a href="https://www.stowers.org/">Stowers Institute for Medical Research</a> describes why experts are studying zebrafish to gain a better understanding of how the immune system responds to injury. Zebrafish have the ability to repair and regenerate organs.



“Organ regeneration offers an exciting opportunity for studying the immune system and to inquire why some species can regenerate organs like the heart or missing limbs while others like humans cannot,” explained Dr. Tatjana Piotrowski.



Zebrafish sensory organ hair cells are an ideal system to investigate the pathways and cell types involved in regeneration since they are easily destroyed with antibiotics and begin regenerating within five hours. This enabled the researchers to identify the exact timing and genetic programs for each anti-inflammatory macrophage activation state.&nbsp;



“Our hypothesis is that human macrophages do not receive the proper chemical activation 'cocktail' to instruct pro-regenerative processes,” said Dr. Nicolas Denans. “Identifying the molecular recipe of macrophage activation in zebrafish may one day enable us to design regenerative immunotherapies in humans.”&nbsp;&nbsp;&nbsp;



“The new evidence is a valuable resource for comparative studies on the genetic programs involved in macrophage-mediated repair and regeneration. In other words, different types of injuries may induce different kinds of inflammatory responses. We want to decipher whether this 'language' is universal or if there are a variety of dialects."



Video Credit: Stowers Institute for Medical Research&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

How the immune system responds to injury

[sendtonews key="0dEcERCq61-2283382-12187" type="single"] Today’s Video of the Day from Stowers...

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes how record-breaking heat expressed itself around the world in 2022.



Scientists have determined that 2022 was the 5th warmest year since 1880. Furthermore, the last nine consecutive years have been the warmest on record.



From devastating floods and wildfires to natural disasters like Hurricane Ian, 2022 showed us yet again how a warming climate affects people across the globe.&nbsp;



"As we look back at 20:22 and years past, we see that each year we better understand the challenges we face and how important it is to meet them," says NASA.



Video/ Image Credit: NASA Goddard



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

2022 illustrated the consequences of a warming climate

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Earth,Like,Exoplanet,3d,Render

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes two exoplanets that are orbiting a star 218 light-years away. A team of researchers led by the University of Montreal has found evidence that these planets are "water worlds."



The experts used data from NASA’s Hubble and Spitzer Space Telescopes. They discovered that exoplanets Kepler-138 c and Kepler-138 could be composed largely of water.



"We previously thought that planets that were a bit larger than Earth were big balls of metal and rock, like scaled-up versions of Earth, and that's why we called them super-Earths," explained study co-author Björn Benneke.&nbsp;



"However, we have now shown that these two planets, Kepler-138 c and d, are quite different in nature and that a big fraction of their entire volume is likely composed of water. It is the best evidence yet for water worlds, a type of planet that was theorized by astronomers to exist for a long time."



Video Credit: NASA Goddard



Image Credit: NASA, ESA, and Leah Hustak (STScI)



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Two distant planets may be "water worlds"

[sendtonews key="QIoVYJqRBi-2434608-12187" type="single"] Today's Video of the Day from NASA...

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Satellites reveal how Earth's systems are interconnected Today’s Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes Earth’s interconnected systems, and how this network is affected by rising temperatures.&nbsp;



During 2020, average global temperatures matched the hottest year on record. The hurricane season was also record-breaking, with many of the storms intensifying at extraordinary speeds. Hot water in the ocean is fuel for hurricanes. The satellite data shows that it's all one interconnected system showing how Satellites reveal how Earth's systems are interconnected.



According to NASA, dust swept up from Northern Africa plays a major role in the formation of hurricanes, and is also a key source of fertilization in the Amazon rainforest. As a result of<a href="https://www.earth.com/news/seagrass-wasting-disease-is-fueled-by-climate-change/"> climate</a> change, dust plumes are expected to decline, which will have an effect on vegetation far away.&nbsp;



Images from Earth-observing satellites show how the world’s plant life is affected by natural disasters, fires, and deforestation. Satellites also reveal how widespread changes in vegetation impact waterways,&nbsp; the climate, air quality. Satellites communicate by using radio waves to send signals to the antennas on the Earth. "Earth From Space" is a groundbreaking two-hour special that reveals a spectacular new space-based vision of our planet. 



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Satellites reveal how Earth's systems are interconnected

[sendtonews key="JbW4VsY53O-1632195-12187" type="single"] Satellites reveal how Earth's systems are interconnected...

Today’s Video of the Day from the <a href="https://welcome.miami.edu/">University of Miami</a> Rosenstiel School of Marine and Atmospheric Science explores how changes in water temperatures have affected tiger shark habitats and movements in the North Atlantic Ocean. The study reveals that rising temperatures have caused the sharks to shift toward the poles over the past 40 years.



“Tiger shark annual migrations have expanded poleward, paralleling rising water temperatures,” explained study lead author Neil Hammerschlag. “These results have consequences for tiger shark conservation, since shifts in their movements outside of marine protected areas may leave them more vulnerable to commercial fishing.”



The researchers analyzed nine years of tracking data from satellite-tagged tiger sharks, combined with four decades of conventional tag and recapture data provided by National Oceanic and Atmospheric Administration (NOAA) Cooperative Shark Tagging Program.



The experts found that during the last decade of record heat, for every one-degree Celsius increase in water temperatures, tiger sharks migrated further poleward by over 400 kilometers. They also migrated two weeks earlier than usual to waters off the northeastern coast of the United States.



“Given their role as apex predators, these changes to tiger shark movements may alter predator-prey interactions, leading to ecological imbalances, and more frequent encounters with humans,” concluded Professor Hammerschlag.



Video Credit: University of Miami Rosenstiel School of Marine and Atmospheric Science



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Tiger sharks are shifting poleward as temperatures rise

Today’s Video of the Day from the University of Miami...