Sagan's team created the greatest puzzle of all time, which you can only solve if your species understands the basic nature of the universe.

NASA's most famous astronauts secretly claimed that they encountered an alien presence on the moon and were told to keep it quiet for decades. Physicist Maaneli Derakhshani told the American Alchemy ...

If there are indeed other beings in our galaxy, and they are sophisticated enough to traverse the expanse of space, their very first encounter with humanity might not be with a human. Rather, they ...