Astrobiologist Lisa Kaltenegger spends her days building miniature worlds. Kaltenegger and her colleagues study how different species and combinations of bacteria, plants, and fungi change the ...

The first sign of possible extraterrestrials detected in the cosmos didn't come in the form of little green aliens flying around in saucer-shaped spacecraft. In fact, the life that could be – emphasis ...

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They're baaaaack, and as peevish as ever. Well, not exactly. To say that the nasty aliens in Ridley Scott's eponymous franchise have returned is wrong. His new movie, "Alien: Covenant," is a prequel, ...