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Evaluating Claims of Oldest Fossil Microbes

Are these fossils 3.45 billion years old? Are they even fossils? Serious questions need to be asked when the news gets excited about world records for oldest life on Earth.

Mars Life Hopes Reduced

Key assumptions about habitability on Mars have fallen, but astrobiologists try to keep hope alive.

Here Come the Martians Again

The "science" of astrobiology was launched when strange markings in a Martian meteorite were interpreted to be evidence of life. Here comes another one.

How to Liven Up Dead Geology

A new study shows some carbon compounds from Mars formed, not by living organisms, but from geological and chemical processes. What does life have to do with it? Ask some science reporters.
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