When it comes to the search for life elsewhere in the universe, methane and other chemical compounds are seen as signs of ...
Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets.
Space.com on MSN
Could evidence of life on Mars be hiding in clay? Europe wants to send a rover to check
ESA's Rosalind Franklin rover will investigate possible signs of life in Martian clay.
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