Roughly four and a half billion years ago the planet Theia slammed into Earth, destroying Theia, melting large fractions of ...

The moon is weird. It's completely unlike anything else in the solar system. So how did our planet end up with such a special ...

Over 4.6 billion years ago, Earth took shape from a spinning cloud of dust and gas surrounding the young sun. Tiny particles within this cloud collided and clumped together, driven by gravity and ...

Timing is everything these days. Our communications and GPS networks all depend on keeping careful track of the precise timing of signals—including accounting for the effects of relativity. The deeper ...

New research suggests that Theia, the object whose collision with Earth is theorized to have caused the formation of the moon ...

Perhaps the greatest, mind-bending quirk of our universe is the inherent trouble with timekeeping: Seconds tick by ever so slightly faster atop a mountain than they do in the valleys of Earth. For ...