Add Yahoo as a preferred source to see more of our stories on Google. Life on Earth is thought to have emerged from the primordial ooze some four billion years ago. Now a provocative new study argues ...

Research indicates that Earth's oxygen-rich atmosphere will remain for approximately 1.08 billion years. Scientists used ...

How did life go from tiny organisms to large, complex creatures? Scientists see clues in fossils from as far back as 570 ...

Is there life elsewhere, or is Earth unique in the universe? This is one of humanity’s great unanswered questions. One way to approach this mystery is to investigate how life began here on Earth. Our ...

Earth is so far the only known planet on which life exists—with liquid water and a stable atmosphere. However, the conditions were not conducive to life when it formed. The gas-dust cloud from which ...

We have only one example of biology forming in the universe—life on Earth. But what if life can form in other ways? How do you look for alien life when you don't know what alien life might look like?

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Some scientists suspect that microorganisms can hop between planets by jumping aboard debris kicked up by asteroid strikes. NASA / JPL-Caltech For decades, some of Earth’s brightest scientists have ...

When an astrobiologist says “life is hard,” they may be speaking on a cosmic level. They could mean that life itself is a puzzle we are nowhere near solving. “We’re like second graders when it comes ...

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