The giant teeth can reveal clues about pollutants in the Narwhal's diet.
Bacteria and fungi were hurled into Earth’s middle stratosphere, which resembles many of Mars’ harsh conditions.
A controversial theory suggests that life could pre-date Earth.
Exactly how lucky did we get?
You don’t need to spend a ton of money to travel to remote locations.
Frozen water could be hiding in dark shadowy pockets scattered across the moon.
A unique trick could let microbes zip from Earth to Mars, for example, and survive the trek.
A new estimate suggests the Milky Way is home to six billion Earth-like planets. So far, we’ve found just one...
What we thought was lava might be mud instead.
Enormous predators prowled the land, rivers, and sky of ancient Morocco.
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