Caltech President Ray Jayawardhana studies planets beyond our solar system in the search for alien life. But he now faces ...

Earth already contains organisms that survive conditions humans could never endure. Alien life, if it exists, may force ...

Former NASA astronaut Winston Scott said he believes intelligent alien life exists, but cautioned that military conflict in ...

Add Yahoo as a preferred source to see more of our stories on Google. A new study suggests alien life could be going undetected because scientists focus more on avoiding false discoveries than missing ...

When it comes to the search for life elsewhere in the universe, methane and other chemical compounds are seen as signs of biology because they are often produced by living microbes. However, ...

To support alien life, a planet doesn’t have to be exactly like Earth, but it does need a few key ingredients. First, it ...

Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets. Things mistaken for UFOs. In the search for alien life, humans have been fooled ...

Hollywood makes initiating alien contact seem much easier than it has proven to be. In E.T. the Extraterrestrial, E.T. got stranded on earth when his alien compadres abandoned their botany mission. In ...

Donald Trump has pledged to release classified government files on alien and extraterrestrial life, sparking widespread excitement and a surge in online conspiracy theories, most prominently the ...