Today's Image of the Day from NASA Earth Observatory features Cyclone Chido, an intense tropical cyclone that caused unprecedented devastation across Southeast Africa in December 2024.



On December 14, Chido struck the islands of Mayotte with wind speeds exceeding 200 km/h (124 mph) and gusts over 225 km/h (140 mph), marking it as the most powerful storm to hit the French territory in at least 90 years.&nbsp;



The <a href="https://www.earth.com/news/fast-moving-tropical-cyclones-are-becoming-more-powerful/" target="_blank" rel="noreferrer noopener">cyclone</a> ultimately made three landfalls - all with winds equivalent to those of a Category 4 tropical cyclone. According to media reports, authorities in Mayotte fear that hundreds and possibly thousands of people have died.



<h2 class="wp-block-heading" id="h-rapid-intensification-of-chido">Rapid intensification of Chido</h2>



“Chido formed in the southeastern Indian Ocean on December 5, 2024. The disturbance rapidly intensified before hitting the Mauritian islands of Agaléga on December 11. The next day, the cyclone peaked in intensity, with sustained winds of about 250 kilometers (155 miles) per hour - equivalent to a strong Category 4 hurricane on the Saffir-Simpson wind scale,” noted <a href="https://earthobservatory.nasa.gov/images/153708/cyclone-chido-pummels-mayotte" target="_blank" rel="noreferrer noopener">NASA</a>.&nbsp;&nbsp;



“According to the Joint Typhoon Warning Center, Cyclone Chido continued to move west in an environment favorable for sustaining storms. That included warm <a href="https://www.earth.com/news/ocean-warming-has-nearly-doubled-in-the-last-decade/" target="_blank" rel="noreferrer noopener">sea surface temperatures</a> of up to 29 degrees Celsius (84 degrees Fahrenheit) and low vertical wind shear.



<h2 class="wp-block-heading" id="h-devastation-of-cyclone-chido-nbsp">Devastation of Cyclone Chido&nbsp;</h2>



The cyclone obliterated entire neighborhoods, particularly in hillside shantytowns inhabited by undocumented migrants. Official reports confirm at least 31 fatalities and thousands of injuries - though the actual death toll may be significantly higher.&nbsp;



The destruction in Mayotte's capital, Mamoudzou, has left approximately 100,000 people homeless. The aftermath has been characterized by a lack of visible assistance from authorities, with residents relying on community support amid concerns over hunger, disease outbreaks, and lawlessness.&nbsp;



<h2 class="wp-block-heading" id="h-landfall-in-mozambique-nbsp">Landfall in Mozambique&nbsp;</h2>



Following its impact on Mayotte, Chido continued westward, making landfall in Mozambique on December 15 near the city of Pemba as a strong Category 4-equivalent intense tropical cyclone.&nbsp;



The storm resulted in at least 34 deaths and 43 injuries across three northern provinces. In neighboring Malawi, Chido claimed two lives.&nbsp;



The cyclone's ferocity, fueled by warmer ocean temperatures attributed to climate change, has raised concerns about the increasing frequency and <a href="https://www.earth.com/news/coastal-hurricanes-are-intensifying-faster-due-to-climate-change/" target="_blank" rel="noreferrer noopener">intensity</a> of such storms in the region.&nbsp;



<h2 class="wp-block-heading" id="h-recovery-efforts-and-vulnerable-communities-nbsp">Recovery efforts and vulnerable communities&nbsp;</h2>



The crisis has highlighted the vulnerabilities of affected regions, particularly Mayotte, which faces challenges of poverty, overcrowding, and inadequate infrastructure.&nbsp;



The lack of preparedness and insufficient emergency response have drawn criticism, highlighting the need for improved disaster management and investment in resilient infrastructure to mitigate the impacts of future climate-induced disasters.&nbsp;



In response to the disaster, French President Emmanuel Macron is scheduled to visit Mayotte, and relief efforts are underway, including the arrival of a ship carrying 180 tons of aid.&nbsp;



However, the scale of destruction and ongoing challenges in delivering assistance to remote and inaccessible areas continue to impede recovery efforts.&nbsp;



<h2 class="wp-block-heading" id="h-climate-fueled-intensification-of-cyclones-nbsp">Climate-fueled intensification of cyclones&nbsp;</h2>



The <a href="https://www.earth.com/news/the-rising-impact-of-tropical-cyclones-in-a-warming-world/" target="_blank" rel="noreferrer noopener">intensification of cyclones</a> due to climate change is a significant and concerning phenomenon. As global temperatures rise, warmer ocean waters provide the energy that fuels tropical cyclones, making them stronger and more destructive.&nbsp;



Higher <a href="https://www.earth.com/news/pacific-ocean-temperatures-highest-in-650-years-greatly-harming-coral-reefs/" target="_blank" rel="noreferrer noopener">sea surface temperatures</a> lead to increased evaporation, which adds more moisture to the atmosphere. This moisture can enhance the rainfall associated with cyclones, increasing the risk of flooding.&nbsp;



Additionally, rising sea levels, driven by the melting of polar ice caps and thermal expansion of seawater, exacerbate storm surge impacts, causing more extensive and severe coastal flooding during cyclonic events.



Changes in atmospheric conditions also play a role. While climate change may not increase the overall frequency of cyclones, it is likely to shift the distribution and intensity of these storms. For instance, studies suggest that a larger proportion of cyclones are reaching the most intense categories.&nbsp;



Furthermore, slower-moving cyclones, a trend linked to weakened steering currents, can linger longer over vulnerable areas, compounding the damage with prolonged heavy rainfall and strong winds.



These changes in cyclone behavior present challenges for disaster preparedness and response. Coastal communities, particularly in low-lying regions, are becoming increasingly vulnerable to the compounded impacts of more powerful storms, highlighting the urgent need for climate mitigation and adaptation strategies.



The image was captured by the VIIRS (Visible Infrared Imaging Radiometer Suite) on the NOAA-20 satellite, about three hours after the storm made landfall.



Image Credit: NASA Earth Observatory&nbsp;



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Cyclone Chido’s path of destruction: A climate wake-up call

Today's Image of the Day from NASA Earth Observatory features...

Today's Image of the Day from NASA Earth Observatory features a 9.5-mile section of Pangong Lake on the western end of the Tibetan Plateau. The image was captured by a crew member onboard the International Space Station. 



“In this winter scene, a sheet of cracked ice tops part of the lake,” noted <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA</a>. “On the left side, open water appears blue. Shallow water offshore of a delta, formed by a small, winding river, appears green."



"Parallel lines along the coastlines of bays are visible in the high-resolution version of this image. These lines indicate raised beaches, which formed in the past when lake levels were higher.”



NASA pointed out that several roads cut across the landscape, including one with switchbacks that ascends a steep slope. "These roads facilitate tourist travel from both India and China.”&nbsp;



<h2 class="wp-block-heading" id="h-migratory-birds-at-pangong-lake-nbsp">Migratory birds at Pangong Lake&nbsp;</h2>



Pangong Lake and its surroundings are home to numerous bird species, particularly <a href="https://www.earth.com/news/migratory-birds-burn-unexpected-amounts-of-protein/" target="_blank" rel="noreferrer noopener">migratory birds</a>. Visitors can spot various waterfowl and waders that are rarely seen elsewhere.



“During the summer, species such as bar-headed geese and Brahminy ducks attract bird watchers to the lake, which is a major breeding ground for migrating birds,” said NASA.



Pangong Lake is one of the few places in India where the endangered black-necked crane is found during its breeding season. 



Ruddy shelduck and brown-headed <a href="https://www.earth.com/news/gulls-are-shifting-their-habitats-to-urban-areas/" target="_blank" rel="noreferrer noopener">gulls</a> are also frequently spotted around the lake. The ruddy shelduck is known for its striking orange-brown body and creamy white head, while the brown-headed gulls are often seen flying or swimming in the lake.



<h2 class="wp-block-heading" id="h-pangong-lake-nbsp">Pangong Lake&nbsp;</h2>



Pangong Lake is a stunning high-altitude lake situated in the <a href="https://www.earth.com/news/temperatures-are-rising-unexpectedly-fast-on-the-tibetan-plateau/" target="_blank" rel="noreferrer noopener">Himalayas</a>, extending from India to the Tibetan Autonomous Region of China. It is renowned for its mesmerizing beauty and dramatic setting, with the lake lying at an elevation of about 4,350 meters.



One of the most distinctive features of Pangong Lake is its changing colors, ranging from shades of blue to green and even red, influenced by the sky's reflection and the lake's mineral content.



This saline water lake is approximately 134 kilometers long and 5 kilometers wide at its broadest point. Despite its considerable size, Pangong Lake is relatively shallow.&nbsp;



The lake gained additional popularity after being featured in several Indian films - most notably the Bollywood hit "3 Idiots." Its remote location requires a permit for visitors, especially due to its proximity to the Line of Actual Control between India and China.



Despite the geopolitical sensitivities surrounding its location, Pangong Lake remains a favorite among tourists for its unparalleled natural beauty and serene environment.



<h2 class="wp-block-heading" id="h-high-altitude-lakes">High-altitude lakes</h2>



High-altitude lakes are unique bodies of water found at elevations typically above 3,000 meters (about 10,000 feet) in mountain ranges like the <a href="https://www.earth.com/news/himalayan-glaciers-retreating-threat-is-much-worse-than-previously-believed/" target="_blank" rel="noreferrer noopener">Himalayas</a>, Andes, and Rockies. 



These lakes are formed either by glacial activity, where glaciers erode the earth to create depressions that fill with melted snow and rainwater, or when natural dams created by landslides or moraines trap water in valleys.



<h3 class="wp-block-heading" id="h-extreme-environments">Extreme environments</h3>



The conditions at high altitudes make these lakes distinct in several ways. The climate is typically colder and harsher, with significant temperature variations between day and night. 



This extreme environment affects both the physical characteristics of the <a href="https://www.earth.com/news/alarming-study-most-of-the-worlds-largest-lakes-are-quickly-losing-water/" target="_blank" rel="noreferrer noopener">lakes</a> and the types of ecosystems they support. For example, due to lower atmospheric pressure, the boiling point of water is reduced, which can affect the type of life that can survive in these regions.



<h3 class="wp-block-heading" id="h-critical-habitats">Critical habitats</h3>



Biologically, high-altitude lakes often have limited biodiversity because only certain types of plants and animals can tolerate the cold temperatures and lower oxygen levels in the water. 



Despite this, these lakes are crucial habitats for some unique species of fish, birds, and other wildlife. They also serve as important indicators of climate change, as variations in their water levels and temperatures can reflect environmental shifts.



<h3 class="wp-block-heading" id="h-significance-of-high-altitude-lakes">Significance of high-altitude lakes </h3>



Lakes at high altitudes are often clear and pristine, due to the low density of human populations in these areas and minimal industrial activity, making them significant for ecological studies and attractive for tourism. 



However, they are sensitive ecosystems, and increased tourist activity brings challenges like pollution and habitat disruption.



High-altitude lakes are not only beautiful and scientifically significant but also hold cultural importance for local communities, often considered sacred and associated with historical and spiritual significance.



Image Credit: NASA Earth Observatory&nbsp;



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Pangong Lake on the Tibetan Plateau

Today's Image of the Day from the European Space Agency features the star-forming region NGC 604, which is located 2.73 million light-years away from Earth in the Triangulum Galaxy (M33). The image was captured by the James Webb Space Telescope.



By studying regions like NGC 604, astronomers can gain insights into the complex interactions between stars and the interstellar medium, as well as the conditions that lead to the birth of stars. This, in turn, helps in understanding the evolution of <a href="https://www.earth.com/news/galaxies-like-our-own-milky-way-are-not-unique/" target="_blank" rel="noreferrer noopener">galaxies</a> and the universe as a whole.



<h2 class="wp-block-heading" id="h-massive-stars-of-ngc-604">Massive stars of NGC 604</h2>



"Sheltered among NGC 604’s dusty envelopes of gas are more than 200 of the hottest, most massive kinds of stars, all in the early stages of their lives," said <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



"These types of stars are known as B-types and O-types, the latter of which can be more than 100 times the mass of our own Sun. It’s quite rare to find this concentration of them in the nearby universe. In fact, there’s no similar region within our own Milky Way galaxy."



According to ESA, this concentration of massive stars, combined with its relatively close distance, means that NGC 604 gives astronomers an opportunity to study these objects at a fascinating time early in their life.



<h2 class="wp-block-heading" id="h-gigantic-region-of-ionized-hydrogen">Gigantic region of ionized hydrogen</h2>



NGC 604 is one of the largest known regions of ionized hydrogen, also known as an H II region. This nebula is significantly larger than the Orion Nebula, which is one of the most well-known H II regions in our own <a href="https://www.earth.com/news/large-amount-of-dark-matter-may-be-missing-from-the-milky-way/" target="_blank" rel="noreferrer noopener">Milky Way galaxy</a>.&nbsp;



NGC 604 spans about 1,500 light-years across, making it one of the largest H II regions in the Local Group of galaxies. This group includes the Milky Way, the Andromeda Galaxy, and about 54 other smaller galaxies.&nbsp;



<h2 class="wp-block-heading" id="h-ngc-604-starburst-phenomenon">NGC 604 starburst phenomenon </h2>



Within NGC 604, there are hundreds of young, hot, massive <a href="https://www.earth.com/news/stars-at-the-edge-of-our-milky-way-galaxy-travel-more-slowly/" target="_blank" rel="noreferrer noopener">stars</a>. These stars have ionized the surrounding gas, causing it to glow and creating the nebula. The region is a prime example of a starburst phenomenon, where stars form at a much higher rate than in typical galactic conditions.



“The bright orange streaks in this image signify the presence of carbon-based molecules known as polycyclic aromatic hydrocarbons, or PAHs," explained ESA.



"As you travel further from the immediate cavities of dust where the star is forming, the deeper red signifies molecular hydrogen. This cooler gas is a prime environment for star formation. Ionized hydrogen from ultraviolet radiation appears as a white and blue ghostly glow."



<h2 class="wp-block-heading" id="h-more-about-star-formation">More about star formation </h2>



Star formation is crucial for the evolution of galaxies and the synthesis of heavy elements. In the cores of stars, elements heavier than helium are created.



The elements are spread throughout the <a href="https://www.earth.com/news/ancient-stars-shakti-shiva-shaped-milky-way-galaxy/" target="_blank" rel="noreferrer noopener">galaxy</a> when stars reach the end of their lives and expel their material - either gently through winds or violently via supernova explosions. This enriching process allows for the formation of new stars and planets, and ultimately, the potential for life.



<h3 class="wp-block-heading">Cloud collapse</h3>



The process begins when part of a molecular cloud becomes unstable and starts to collapse under its own gravity. This can be triggered by events like shock waves from nearby <a href="https://www.earth.com/news/supernova-explosions-could-damage-distant-planets/" target="_blank" rel="noreferrer noopener">supernovae</a>, galactic collisions, or the influence of other massive stars.



<h3 class="wp-block-heading">Formation of a protostar</h3>



As the cloud collapses, it fragments into smaller clumps. Each clump will eventually form one or more stars. 



The material within these clumps continues to fall inward, heating up as it does so, eventually forming a warm core called a protostar. At this stage, the protostar is not yet hot enough for nuclear fusion (the process that powers stars) to occur.



<h3 class="wp-block-heading">Accretion disk</h3>



Around the protostar, material from the surrounding cloud continues to fall inward, forming a rotating disk. This material slowly accretes onto the protostar, increasing its mass.



<h3 class="wp-block-heading">Nuclear fusion begins</h3>



Once the core of the protostar reaches a high enough temperature and pressure, hydrogen atoms begin to fuse into helium, releasing energy in the process. This marks the transition from a protostar to a main sequence star, like our sun.



<h3 class="wp-block-heading">Main sequence and beyond</h3>



The star will spend the majority of its life in the main sequence stage, where it balances the gravitational forces trying to collapse it and the outward pressure from nuclear fusion. 



Eventually, the star will exhaust its hydrogen fuel. Its subsequent evolution will depend on its initial mass, leading to various end stages such as red giants, supernovae, neutron stars, or black holes.



Image Credit: NASA/ESA/CSA James Webb Space Telescope



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Young, massive stars in the Triangulum Galaxy

Today's Image of the Day from the European Space Agency...

Today's Image of the Day from NASA Earth Observatory features the Fedchenko Glacier in the Pamir Mountains of Tajikistan. It is one of the world's longest glaciers outside of the polar regions.&nbsp;



“An astronaut aboard the International Space Station took this photo of glaciers in the high-elevation valleys of the Pamir Mountains of Central Asia. The upper portion of Fedchenko Glacier crosses the center of the scene.”



NASA noted that most of the larger glaciers in the image show a prominent pattern of light- and dark-brown parallel lines.&nbsp;



“The darker ‘streamlines,’ known as medial moraines, give a sense of the direction of flow of the ice down the valleys. These are concentrations of debris that has been eroded by the glacier from the adjacent mountainsides or a rocky outcrop,” said NASA.



<h2 class="wp-block-heading" id="h-fedchenko-a-high-altitude-glacier">Fedchenko: A high-altitude glacier</h2>



Fedchenko Glacier stretches for approximately 48 miles and covers an area of around 270 square miles. This massive glacier is a critical source of <a href="https://www.earth.com/news/satellites-reveal-a-sudden-drop-in-global-freshwater-levels/" target="_blank" rel="noreferrer noopener">freshwater</a>, feeding several rivers and influencing the region's hydrology.



Fedchenko Glacier lies at high altitudes, with its origins in the high peaks of the Pamirs, where snow accumulates heavily. Despite being situated in a relatively arid region, the glacier's significant size and volume are maintained by substantial snowfall.&nbsp;



Named after Alexei Pavlovich Fedchenko, a Russian explorer and naturalist, the glacier was first surveyed in 1928 during Soviet-era expeditions. It plays a crucial role in climate studies, as changes in its length and mass provide insights into the effects of global warming in Central Asia.&nbsp;



The glacier is also part of a spectacular and remote landscape, surrounded by towering <a href="https://www.earth.com/news/early-humans-preferred-the-mountains-and-it-changed-our-evolution/" target="_blank" rel="noreferrer noopener">mountains</a> and rugged terrain, making it a key feature of the Pamirs' natural beauty.&nbsp;



<h2 class="wp-block-heading" id="h-threats-to-glaciers-worldwide">Threats to glaciers worldwide</h2>



Like many glaciers worldwide, Fedchenko faces the threat of retreat due to <a href="https://www.earth.com/news/peru-has-lost-over-half-of-its-glaciers-in-six-decades/" target="_blank" rel="noreferrer noopener">global warming</a>, raising concerns about water availability and ecosystem changes in the region.



Rising global temperatures caused by greenhouse gas emissions are the primary driver of glacier melting. Warmer temperatures not only melt glacier surfaces but also increase the flow of meltwater beneath them, accelerating their disintegration.



<h3 class="wp-block-heading" id="h-human-activities-and-pollution-nbsp">Human activities and pollution&nbsp;</h3>



Deforestation and urbanization exacerbate these effects by reducing reflective snow cover and increasing heat absorption in nearby areas.&nbsp;



Airborne pollutants like soot and black carbon darken glacier surfaces, reducing their ability to reflect sunlight and speeding up the rate of melting. 



Industrial activities and tourism in glacier regions add physical stress and pollution, further degrading these fragile ecosystems.



<h3 class="wp-block-heading" id="h-water-supplies">Water supplies</h3>



The loss of glaciers has far-reaching consequences. It disrupts freshwater supplies for millions of people who depend on glacial runoff for drinking water, agriculture, and hydropower.&nbsp;



<h3 class="wp-block-heading" id="h-rising-sea-levels">Rising sea levels</h3>



<a href="https://www.earth.com/news/melting-glaciers-unleash-invasive-species-into-unexpected-areas/" target="_blank" rel="noreferrer noopener">Melting glaciers</a> contribute to rising sea levels, threatening coastal communities and ecosystems worldwide. Additionally, the loss of glaciers impacts biodiversity, as many species rely on cold, glacial habitats for survival.



<h3 class="wp-block-heading" id="h-protecting-glaciers">Protecting glaciers</h3>



Efforts to mitigate these threats focus on reducing <a href="https://www.earth.com/news/melting-glaciers-are-hidden-sources-of-greenhouse-gases/" target="_blank" rel="noreferrer noopener">greenhouse gas</a> emissions, protecting glacier regions from industrial exploitation, and promoting sustainable tourism practices.&nbsp;



However, without urgent action, the continued decline of glaciers will have profound implications for the planet's climate, water systems, and ecosystems.



<h2 class="wp-block-heading" id="h-the-pamir-mountains-nbsp">The Pamir Mountains&nbsp;</h2>



The Pamir Mountains, often called the "Roof of the World," are a vast and rugged mountain range located in Central Asia.&nbsp;



They span across Tajikistan, Afghanistan, China, and Kyrgyzstan, forming a vital part of the junction where the Himalayas, the Tian Shan, the Karakoram, the Kunlun, and the Hindu Kush converge.&nbsp;



With peaks soaring over 7,000 meters, including Ismoil Somoni Peak, the range is home to some of the highest altitudes on Earth.



The Pamir Mountains have been central to trade and cultural exchange for centuries, serving as a critical segment of the ancient Silk Road.&nbsp;



Today, the mountains are a popular destination for trekkers and explorers drawn by their breathtaking beauty and challenging terrain.



The Pamirs are not only a natural wonder but also a biological treasure trove, supporting unique wildlife that is adapted to extreme altitudes.&nbsp;



Culturally, the mountains are home to diverse communities, each with its unique traditions and ways of life, shaped by the harsh but majestic environment.



Image Credit: NASA Earth Observatory



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Fedchenko Glacier in the Pamir Mountains

Today's Image of the Day from the European Space Agency features the spiral galaxy NGC 5643, which is located roughly 40 million light-years away in the constellation Lupus.&nbsp;



NGC 5643 belongs to the Hubble classification SBc, indicating that it is a barred spiral galaxy with loosely wound arms.&nbsp;



Its orientation, nearly face-on to Earth, provides astronomers with an exceptional view of its detailed spiral structure and central bar.



<h2 class="wp-block-heading" id="h-ngc-5643-a-grand-design-spiral-nbsp">NGC 5643: A grand design spiral&nbsp;</h2>



“NGC 5643 is what’s known as a grand design spiral, referring to how the galaxy’s two large, winding spiral arms are clear to see,” noted <a href="https://www.esa.int/ESA_Multimedia/Images">ESA</a>. “The spiral arms are defined by bright blue stars, lacy reddish-brown dust clouds and pink star-forming regions.”



“As fascinating as the galaxy appears at visible wavelengths, some of NGC 5643’s most interesting features are invisible to the human eye.”&nbsp;



<h2 class="wp-block-heading" id="h-intense-activity-in-ngc-5643">Intense activity in NGC 5643</h2>



This galaxy is notable for its Seyfert 2 nucleus, a type of active galactic nucleus (AGN). The intense activity in its core is powered by a supermassive <a href="https://www.earth.com/news/awakening-of-a-black-hole-witnessed-for-the-first-time/">black hole</a> that accretes surrounding material, emitting energy across a wide range of wavelengths.&nbsp;



“When a supermassive black hole ensnares gas from its surroundings, the gas collects in a disc that heats up to hundreds of thousands of degrees. The superheated gas shines brightly across the electromagnetic spectrum, but especially at X-ray wavelengths,” said ESA.



Observations have revealed jets and outflows of material emanating from the nucleus, likely driven by the black hole’s activity.&nbsp;



NGC 5643’s AGN has been studied extensively for its role in galactic evolution, particularly in how its energetic processes interact with the galaxy’s interstellar medium.



<h2 class="wp-block-heading" id="h-the-mystery-of-ngc-5643-x-1">The mystery of NGC 5643 X-1</h2>



However, ESA pointed out that NGC 5643’s active galactic nucleus isn’t the brightest source of X-rays in the galaxy.&nbsp;



“Researchers using ESA’s XMM-Newton discovered an even brighter X-ray-emitting object, called NGC 5643 X-1, on the galaxy’s outskirts. What could be a more powerful source of X-rays than a <a href="https://www.earth.com/news/how-do-black-holes-become-supermassive/">supermassive black hole</a>?”&nbsp;



“Surprisingly, the answer appears to be a much smaller black hole! While the exact identity of NGC 5643 X-1 is not yet known, evidence points to a black hole that is about 30 times more massive than the Sun.”&nbsp;



“Locked in an orbital dance with a companion star, the black hole ensnares gas from its stellar companion, creating a superheated disc that outshines the galactic center,” said ESA.



<h2 class="wp-block-heading" id="h-star-formation-in-ngc-5643">Star formation in NGC 5643</h2>



NGC 5643 also exhibits prominent regions of <a href="https://www.earth.com/news/six-rogue-worlds-discovered-inside-a-young-star-forming-nebula/">star formation</a> within its spiral arms. These areas are rich in gas and dust - the raw materials for birthing new stars - and glow brightly in ultraviolet and infrared light.&nbsp;



Observations from the Hubble Space Telescope and the Very Large Telescope (VLT) have helped uncover the complex interplay between star formation and the galaxy's central activity.



<h2 class="wp-block-heading" id="h-extended-ionized-gas-regions-nbsp">Extended ionized gas regions&nbsp;</h2>



A defining feature of NGC 5643 is the presence of its extended ionized gas regions, which are shaped by the galaxy's AGN activity and star-forming regions.&nbsp;



These structures have been mapped through optical spectroscopy, revealing intricate patterns that help astronomers understand the physical conditions of the gas, such as density, temperature, and composition.



The galaxy also has a dust lane that crosses its nucleus, partially obscuring direct observations of the central region in visible light.&nbsp;



Overall, NGC 5643 offers a fascinating glimpse into the dynamics of barred <a href="https://www.earth.com/news/the-mesmerizing-beauty-of-spiral-galaxies/">spiral galaxies</a> with active nuclei, serving as a valuable resource for studying the interactions between supermassive black holes, star formation, and galactic evolution.



<h2 class="wp-block-heading" id="h-the-constellation-lupus">The constellation Lupus</h2>



Lupus is a constellation located in the southern sky, its name meaning "wolf" in Latin. It has been known since antiquity and was cataloged by the Greek astronomer Ptolemy.&nbsp;



Once part of the larger constellation Centaurus, Lupus was later recognized as a distinct constellation. It is relatively faint but holds historical significance in mythology, often associated with a sacrificial wolf in ancient stories.



Lupus is bordered by other constellations like Scorpius, Centaurus, and Libra. Its stars do not form a particularly striking pattern, but it contains a variety of interesting astronomical features. Among them are numerous double stars, globular clusters, and other deep-sky objects, visible through telescopes.&nbsp;



For observers in the Southern Hemisphere, Lupus is best seen in the winter and spring months, while it appears closer to the horizon for those in northern latitudes.



This constellation also lies along the <a href="https://www.earth.com/news/stars-at-the-edge-of-our-milky-way-galaxy-travel-more-slowly/">Milky Way</a>, offering a rich field of stars and nebulae for stargazers. Despite its modest brightness, Lupus holds a special place in the science of astronomy.



Image Credit: NASA/ESA Hubble Space Telescope



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NGC 5643: Secrets of a spiraling galactic powerhouse

When we talk about the prevention and management of cancer, we don’t usually think that diet changes would be very helpful. But a recent study begs to differ.



The research suggests that dietary changes may play a role in slowing tumor growth in cancer patients. 



Experts at UCLA focused on men with early-stage prostate cancer and observed notable differences in tumor progression based on dietary habits.



The findings could pave the way for lifestyle changes to complement cancer treatment strategies.



<h2 class="wp-block-heading" id="h-diet-and-cancer-progression">Diet and cancer progression</h2>



The year-long study included 100 men with early-stage prostate <a href="https://www.earth.com/news/ketogenic-diet-may-help-the-body-kill-cancer-cells/" target="_blank" rel="noreferrer noopener">cancer</a>. Researchers divided participants into two groups. 



One group followed a diet low in omega-6 fats (found in seed oils) and high in omega-3 fats (found in fish like salmon). The other group continued their usual Western diet.



By the end of the study, participants who adjusted their diets showed a 15% decrease in tumor aggression markers. 



Meanwhile, the group on a standard Western diet saw a 24% increase in these markers. These results suggest that dietary fats may influence cancer progression.



"Our findings suggest that something as simple as adjusting your diet could potentially slow cancer growth and extend the time before more aggressive interventions are needed," noted Dr. William Aronson, a professor of urology at <a href="https://www.ucla.edu" target="_blank" rel="noreferrer noopener">UCLA</a> and the study’s lead researcher.



<h2 class="wp-block-heading" id="h-seed-oils-of-the-western-diet">Seed oils of the Western diet </h2>



Seed oils, such as canola, corn, and cottonseed oils, are staples of the Western diet. They are rich in omega-6 fats, which have been linked to increased inflammation in some studies. 



Inflammation, in turn, can fuel cancer growth by damaging tissues and weakening the body’s ability to <a href="https://www.earth.com/news/ai-is-the-next-frontier-in-cancer-treatment/" target="_blank" rel="noreferrer noopener">fight tumors</a>.



On the other hand, omega-3 fats, found in fish, nuts, and flaxseeds, are known for their anti-inflammatory properties. 



They may support the immune system and reduce tumor growth risks. Previous animal studies also support the idea that lowering omega-6 intake while increasing omega-3 intake can slow cancer progression.



<h2 class="wp-block-heading" id="h-non-invasive-interventions">Non-invasive interventions</h2>



Prostate cancer is the second-leading cause of <a href="https://www.earth.com/news/banana-peel-flour-adds-cancer-fighting-nutrients-to-snacks/" target="_blank" rel="noreferrer noopener">cancer</a>-related deaths in American men. An estimated&nbsp;299,010 cases&nbsp;will be diagnosed in 2024, with approximately&nbsp;201,000 patients&nbsp;in the early stages of the disease. 



Many patients opt for active monitoring rather than immediate surgery, radiation, or chemotherapy.



For these patients, lifestyle changes, including diet modifications, could delay the need for aggressive treatments. The study’s results highlight a potential non-invasive option to manage early-stage prostate cancer. 



"This significant difference suggests that the dietary changes may help slow cancer growth, potentially delaying or even preventing the need for more aggressive treatments," said Dr. Aronson.



<h2 class="wp-block-heading" id="h-seed-oils-and-cancer-risks">Seed oils and cancer risks</h2>



Despite these findings, leading medical bodies, including the American Heart Association, maintain that seed oils are safe and not linked to <a href="https://www.earth.com/news/which-dietary-changes-are-best-for-cancer-prevention/" target="_blank" rel="noreferrer noopener">cancer</a>. 



However, public opinion on seed oils has become increasingly divided. Critics, including public figures like Robert F. Kennedy Jr., claim seed oils contribute to the obesity epidemic and related health concerns.



Adding to the controversy, a recent study from the University of South Florida linked seed oils to rising cases of colon cancer in young adults. 



The researchers suggested that the fats in seed oils might promote inflammation, thus creating an environment conducive to tumor growth.



<h2 class="wp-block-heading" id="h-balanced-approach-to-diet">Balanced approach to diet</h2>



The UCLA researchers emphasized that, while their findings are promising, more research is needed to confirm the connection between diet and cancer progression. 



They also stressed the importance of maintaining a balanced diet rather than eliminating specific foods.



According to Dr. Aronson, the study&nbsp;is an important step toward understanding how diet can potentially influence prostate cancer outcomes.



Future studies could offer more targeted dietary recommendations for the thousands of men diagnosed with prostate cancer each year. 



A deeper understanding of how dietary fats influence cancer might help to reduce reliance on invasive and costly treatments like surgery or chemotherapy.



<h2 class="wp-block-heading" id="h-can-diet-be-a-tool-against-cancer">Can diet be a tool against cancer?</h2>



The evidence suggests that cutting back on omega-6 fats and incorporating omega-3-rich foods could slow the progression of early-stage prostate <a href="https://www.earth.com/news/molecular-jackhammers-a-breakthrough-in-cancer-treatment/" target="_blank" rel="noreferrer noopener">cancer</a>. 



However, experts agree that there is a need for further research to validate these findings and provide actionable dietary guidelines.



For now, adopting a balanced diet rich in anti-inflammatory foods like fish, nuts, and seeds may offer additional benefits for <a href="https://www.earth.com/news/caterpillar-fungus-slows-down-growth-of-cancer-cells/" target="_blank" rel="noreferrer noopener">cancer</a> patients. While diet alone may not cure cancer, it could play a significant role in improving outcomes and quality of life.



The study is published in the journal <a href="https://ascopubs.org/doi/abs/10.1200/JCO.24.00608">Clinical Oncology</a>.



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Many cooking oils in your diet are now being linked to cancer

When we talk about the prevention and management of cancer,...

The number of humans inhabiting the Earth has steadily increased since Homo sapiens began to assert their dominance over the planet. Now, however, the global population growth trend is on the verge of becoming unsustainable.



Historians report that, by the 10th century, the global headcount hovered around a few hundred million. 



Later, the Industrial Revolution and better living conditions pushed our numbers ever upward. We soared past 1 billion by 1900 and over 6 billion by 2000.



Not long ago, in late 2022, we crossed the 8 billion mark. Now, new studies suggest this steady climb may soon slow down and, eventually, our population might grow smaller, not bigger.



<h2 class="wp-block-heading" id="h-global-population-trend">Global population trend</h2>



Some recent findings, published in <a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(24)00550-6/fulltext" target="_blank" rel="noreferrer noopener">The Lancet</a>, and relying on data from the <a href="https://www.healthdata.org/" target="_blank" rel="noreferrer noopener">Institute for Health Metrics</a> and Evaluation at the University of Washington, point to a different future.



According to these projections, by 2050 about 155 out of 204 countries will not have enough births to ensure a stable global population count. And by 2100, almost all of them, around 198 out of 204, will be in the same boat.



This has led researchers to believe that deaths will soon outnumber births in many places, which will shift long-held patterns.



“This is our most comprehensive analysis to date,” said <a href="https://www.healthdata.org/about/people/stein-emil-vollset" target="_blank" rel="noreferrer noopener">Dr. Stein Emil Vollset</a>, a professor at the Institute for Health Metrics and Evaluation (IHME) at the <a href="https://www.washington.edu/" target="_blank" rel="noreferrer noopener">University of Washington</a>.



<h2 class="wp-block-heading" id="h-why-does-global-population-matter">Why does global population matter?</h2>



The idea that the <a href="https://www.earth.com/news/geologists-found-the-worlds-largest-iron-ore-deposit/">world</a> might become a less crowded place raises a few eyebrows, but also a few hopes. Some have argued that thinning numbers might help reduce the strain on certain resources.



There is talk of a demographic dividend, a scenario where fewer dependents and more working-age adults boost economies.



Yet, in many places the total fertility rate has dropped below replacement levels and stays there, without any predicted bounce back. The old assumption that decreasing fertility would fix itself has not been supported by recent data.



When fewer <a href="https://www.earth.com/news/babies-are-born-with-the-ability-to-recognize-the-beat-in-music/" target="_blank" rel="noreferrer noopener">babies are born</a>, the workforce thins out in a matter of decades. 



Economic systems depend on a steady stream of workers, consumers, and taxpayers. If countries produce fewer citizens, they may struggle to maintain productivity and keep growth on track.



Economists worry that, as population structures skew towards older groups, tax bases might shrink, and this could make it harder to pay for services that keep society running smoothly.



Some analyses of demographic shifts have shown that countries with aging populations feel strain on their labor supply, which may lead to shifts in markets and wage structures.



<h2 class="wp-block-heading" id="h-caring-for-older-generations">Caring for older generations</h2>



A decreasing global population also means a rising proportion of <a href="https://www.earth.com/news/public-perception-of-old-age-has-shifted-to-later-in-life/" target="_blank" rel="noreferrer noopener">older people</a>.



While living longer can be a sign of progress, it also brings its own problems. More older adults need care for chronic conditions, assisted living, and medical services that handle age-related diseases.



Health care systems might need to reinvent themselves to deal with shortages in skilled medical staff and the growing demand for long-term support. 



Without enough younger workers, caregiving roles may be harder to fill, putting pressure on families and communities.



Studies have outlined the growing costs of eldercare as populations age, warning that countries must adapt soon or face long waiting times and inadequate care.



<h2 class="wp-block-heading" id="h-global-population-and-the-environment">Global population and the environment</h2>



Fewer humans might sound like a perfect recipe for less stress on forests, oceans, farmland, and energy supplies. 



Reduced consumption could mean less pollution, fewer greenhouse gas emissions, and cleaner water in some areas.



But changing population distribution patterns could complicate resource management. If certain places empty out and others remain crowded, it might be tricky to balance who gets what.



Environmental changes also depend on how people live, not just how many there are. Some research suggests that even with fewer people, lifestyle choices still matter for keeping ecosystems healthy and <a href="https://www.earth.com/news/effective-conservation-efforts-key-to-saving-biodiversity/" target="_blank" rel="noreferrer noopener">maintaining biodiversity</a>.



<h2 class="wp-block-heading" id="h-rewriting-global-influence">Rewriting global influence</h2>



As nations experience shifts in their population counts, political and economic influence could get shuffled. 



Countries that once dominated trade, technology, or culture might find themselves overshadowed by others that manage to keep younger <a href="https://www.earth.com/news/global-population-will-peak-at-10-3-billion-by-2085/" target="_blank" rel="noreferrer noopener">populations engaged</a>.



Alliances that seemed stable might look different when a partner’s population contracts. This could ripple through security agreements, resource negotiations, and geopolitical strategies. 



Realigning priorities might become a necessity as demographic trends change who holds the cards on the world stage.



<h2 class="wp-block-heading" id="h-rethinking-family-decisions">Rethinking family decisions</h2>



Falling fertility rates are often linked to changing social expectations, improved women’s rights, and better access to education. 



There is a growing concern that some leaders might try to push quick fixes that harm personal freedoms.



Policies that put pressure on women to have more children present significant risks, threatening reproductive and sexual rights. 



In some places, such measures could limit access to necessary services or reduce the freedom to choose whether and when to become parents.



Historical analyses warn that forcing fertility through policy often backfires, causing social tension and distrust.



<h2 class="wp-block-heading" id="h-a-new-normal">A new normal</h2>



The notion of an emptier planet comes with no simple answers. A world with fewer new births may <a href="https://www.earth.com/news/anthropocene-when-did-humans-begin-changing-the-earth/" target="_blank" rel="noreferrer noopener">reshape</a> how we build cities, form families, and secure our future.



It might ask us to be more careful in the ways we manage resources, structure <a href="https://www.earth.com/news/dogs-healthcare-needs-change-as-they-enter-old-age/" target="_blank" rel="noreferrer noopener">health care</a>, and plan our economies. Planners, policymakers, and communities may need to think ahead, beyond simply counting heads.



The end of nonstop population growth might signal the beginning of a new kind of progress, where success is measured not by the number of people, but by how well we care for one another.



The full study is published in <a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(24)00550-6/fulltext">The Lancet</a>.



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Global population decline predicted -- what Earth will be like with less people

The number of humans inhabiting the Earth has steadily increased...

Ingenuity, NASA's pioneering Mars helicopter, marked an unprecedented milestone in aviation history when it became the first aircraft to take flight on another world.



Its journey came to an end on January 18, 2024, with a final flight that concluded an era of extraordinary achievements.



<h2 class="wp-block-heading" id="h-journey-into-the-unknown">Journey into the unknown</h2>



A team of engineers at <a href="https://www.jpl.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA’s Jet Propulsion Laboratory</a> in Southern California, in partnership with AeroVironment, has given us an exclusive, behind-the-scenes look into the final voyage of the Ingenuity Mars Helicopter.



Originally designed as a technology demonstration to carry out five experimental test flights over a 30-day period, the helicopter surpassed all expectations. 



The little explorer stayed operational for nearly three years, conducted 72 flights, and expanded its flight range 30 times beyond what was initially planned - tallying more than two hours in flight time.



<h2 class="wp-block-heading" id="h-the-final-ascent-ingenuity-rising-against-gravity">The final ascent: Ingenuity rising against gravity</h2>



The <a href="https://www.earth.com/news/mars-ingenuity-the-first-helicopter-on-the-red-planet-ends-mission-after-3-years/" target="_blank" rel="noreferrer noopener">72nd flight</a>, which we now know as the final one, was planned as a short, vertical hop to assess the flight systems and capture images of the surrounding area.



The data sent back from the flight paints a picture of Ingenuity as it ascended to a height of 40 feet (12 meters), hovered, and took photographs.



The descent was initiated at the 19-second mark, and by the 32nd second, the helicopter had touched down, halting communication. 



It would not be until the next day that contact was re-established with the mission, and images transmitted six days after the flight showed the damage sustained by Ingenuity's <a href="https://www.earth.com/image/16-ingenuitys-rotors/" target="_blank" rel="noreferrer noopener">rotor</a> blades.



<h2 class="wp-block-heading" id="h-unraveling-the-mystery-what-went-wrong">Unraveling the mystery: What went wrong?</h2>



Investigating an accident from a 100-million-mile distance is no easy feat. Without the convenience of the usual "black boxes" or eyewitnesses, the investigators had to rely solely on the data and images transmitted back.



“While multiple scenarios are viable with the available data, we have one we believe is most likely: lack of surface texture gave the navigation system too little information to work with,” explained Håvard Grip, Ingenuity’s first pilot. 



The helicopter's vision navigation system was designed to track visual features on a flat terrain. It worked with impressive accuracy for Ingenuity's first five flights, but flight 72 found the helicopter in an area of Jezero Crater that was filled with relatively featureless, steep sand ripples.



This terrain confused the navigation system, preventing it from providing the velocity estimates necessary for safe landing. 



The resulting navigation errors created high horizontal velocities at touchdown, which led the helicopter to pitch and roll. 



The strain of the rapid landing snapped off all four rotor blades at their weakest point. This resulted in excessive vibration which finally severed the communication.



<h2 class="wp-block-heading" id="h-the-legacy-continues-ingenuity-s-contributions">The legacy continues: Ingenuity's contributions</h2>



Although permanently grounded, Ingenuity's contributions have not ended. It continues to transmit weather data and avionics test data to the Perseverance rover on a weekly basis. 



This information could prove invaluable for future <a href="https://www.earth.com/news/mars-missions-prepare-intense-solar-storms-coming-red-planet/" target="_blank" rel="noreferrer noopener">Red Planet</a> explorations. In addition, lessons from the Ingenuity project have sparked research into future <a href="https://www.earth.com/news/mars-gravity-pulls-earth-closer-to-the-sun-warming-our-climate-scientists-say/" target="_blank" rel="noreferrer noopener">Mars</a> helicopters.



"Because Ingenuity was designed to be affordable while demanding huge amounts of computer power, we became the first mission to fly commercial, off-the-shelf cell phone processors in deep space," said Teddy Tzanetos, Ingenuity's project manager.



Tzanetos also noted that almost four years of continuous operation suggested that not everything on Mars needed to be bigger, heavier, and radiation-hardened in order to function.



<h2 class="wp-block-heading" id="h-the-future-of-flight-on-mars">The future of flight on Mars</h2>



Inspired by Ingenuity, NASA engineers have been testing smaller, lighter avionics for vehicle designs, particularly for the <a href="https://www.earth.com/news/air-samples-from-mars-could-reveal-fascinating-secrets/" target="_blank" rel="noreferrer noopener">Mars Sample Return</a> campaign. 



The data from Ingenuity is also assisting engineers in developing the concept for a future Mars helicopter.



This new venture, currently named Chopper, is approximately 20 times heavier than Ingenuity, is designed to carry several pounds of scientific equipment, and is expected to explore remote Martian locations while traveling up to 2 miles (3 kilometers) in a day.



Ingenuity has broadened our horizons about the future of interplanetary flight. "Ingenuity has given us the confidence and data to envision the future of flight at Mars," concluded Tzanetos.



Information for this article was sourced from the <a href="https://www.jpl.nasa.gov/news/nasa-performs-first-aircraft-accident-investigation-on-another-world/" target="_blank" rel="noreferrer noopener">Jet Propulsion Laboratory</a>.



Image Credit: NASA/JPL



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NASA investigates an aviation accident on another planet

Ingenuity, NASA's pioneering Mars helicopter, marked an unprecedented milestone in...

<div id="58e3ebce955a315103d39bd1" class="vdb_player vdb_58e3ebce955a315103d39bd158d96b98cd4fed198a0d2a49" data-placeholder="//img.vidible.tv/prod/2021-02/19/602fc9db2201e004863980ce/602fc9f10b62b10001358faa_768x432_FES_v1.jpg?w=1600&amp;h=900&amp;q=60"><script src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" type="text/javascript"></script></div>
 
The city of Lusaka in south-central Africa Today&#8217;s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lusaka, the capital city of Zambia, which is located on a high plateau in south-central Africa.  
Lusaka is one of the fastest growing cities in this region, with a population of over two million people.
In Zambia, agriculture is the country’s main source of income and jobs. The principal staple food crop is maize, which is traditionally grown throughout most of the country
The Kafue River is visible cutting across the image from left to right. Water from this river is used for irrigation and hydroelectric power. 
According to the <a href="https://www.bing.com/search?q=nasa&amp;cvid=048002c656784c2d8bca6103007414e1&amp;aqs=edge.0.69i59j0l8.942j0j4&amp;FORM=ANAB01&amp;PC=HCTS">ESA</a>, the Kafue River is the longest river lying solely within Zambia, flowing across the flat plain called Kafue Flats and meandering in a maze of swampy channels and lagoons. The African Development Bank defines Central Africa as Cameroon, the Central African Republic, Chad, the Democratic Republic of the Congo, the Republic of the Congo, Equatorial Guinea, and Gabon. Alos the center of Africa is the most used term used by the United Nations in its geoscheme for Africa. It includes the same countries as the African Development Bank&#8217;s definition, along with Angola, and São Tomé and Príncipe.
Video Credit: ESA  
&#8211;&#8212;
By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer