The leading explanation for all of these mysteries is known as the giant impact hypothesis. According to this story, when the ...

Furthermore, the findings bolster the theory that the moon formed when a giant, Mars -size protoplanet slammed into the young ...

Plus other weird things we learned this week.

Airborne life isn’t a totally farfetched idea: Biologists have found bacteria floating in Earth’s atmosphere at an altitude of 25 miles (41 km), more than three times higher than commercial ...

For centuries, sailors have reported the eerie glow of "milky seas" — vast areas of ocean that shine at night like a soft ...

After Earth's worst mass extinction, surviving ocean animals spread worldwide. Stanford's model shows why this happened.

Illustration of a stage in the formation of the Earth-moon system. The Earth had recently formed (4,600 million years ago) when it was struck by a large protoplanet, sometimes dubbed Theia ...

From the award-winning team of filmmaker Darren Aronofsky (`Black Swan') and producer Jane Root (`America the Story of Us'), this 10-part cinematic event series explores the fragility and wonder of ...