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Recent observations suggest that scientists have identified potential microbial fingerprints in the atmospheres of other planets, raising intriguing questions about the possibility of alien life ...

Potentially dangerous alien bugs hitching a ride to Earth on returning spacecraft will never be allowed to escape, a leading scientist has said. Rock and ice samples brought back from Mars or ...

What would aliens actually look like? While simple life forms like bacteria may be common in the universe, complex ...

Perfectly adapted microorganisms live in extreme environments from deep-sea trenches to mountaintops. Learning more about how these extremophiles survive in hostile conditions could inform scientists ...

When astrobiologists are asked what aliens might look like, many now point not to distant galaxies but to some of the strangest corners of Earth, where researchers on several continents are using ...