Apollo 11 crew

As you would expect, the three astronauts thought long and hard about such deep matters during their ground-breaking voyage. In his book, Aldrin reflects on the realization that alongside Armstrong and Collins, he was the only human being alive or dead not on Earth. He told National Geographic, “It certainly didn’t make me feel lonely, except to realize that we were as far away as people had ever been.” Photo Credit: NASA/Flickr