Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets.

Scientists aren’t finding alien life because they are likely searching for the wrong signals or looking in the wrong places, a new study warns. Astronomers are mainly focused on avoiding “false ...

For generations, artists and science-fiction writers have imagined alien landscapes beneath twin sunsets. The image became iconic in popular culture long before astronomers confirmed that planets ...