Newslink: Could There Be Life on Mars Today?
The search for life on Mars shouldn't focus exclusively on the distant past, some researchers say.
Four billion years ago, the Martian surface was apparently quite habitable, featuring rivers, lakes and even a deep ocean. Indeed, some astrobiologists view ancient Mars as an even better cradle for life than Earth was, and they suspect that life on our planet may have come here long ago aboard Mars rocks blasted into space by a powerful impact.
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