Are we alone in the Universe? With more than 100 billion galaxies in the observable universe and at least 500 billion planets ...

The search for life beyond Earth has always been full of surprises. Strange radio signals have sparked excitement. Odd gases on distant worlds have raised questions. Even ordinary objects have been ...

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

Hollywood makes initiating alien contact seem much easier than it has proven to be. In E.T. the Extraterrestrial, E.T. got ...

A planet with one side permanently roasting and the other frozen in endless darkness might still have a chance of supporting life. Researchers found that heat inside a tidally locked exoplanet could ...

Scientists have identified new clues that could help astronomers spot one of the most famous hypothetical alien ...

Get the latest federal technology news delivered to your inbox. You might think this column is about UFOs and the Pentagon's ...

With new technologies come new opportunities. And that is especially true in astronomy—with every new advanced telescope, we ...

A Soviet astronomer in the 1960s proposed a scale to classify hypothetical alien civilizations. Here’s why the framework is ...

Efforts to revive the thylacine and woolly mammoth are forcing conservationists to face a long-overdue debate over what kind ...