From the water that covers most of it to the moon that orbits it, here are some bizarre things about our home planet that science still doesn't completely understand.

A new Alien: Earth trailer has finally shown a xenomorph on earth — and there’s a quite horrible shot of a sheep with a ...

Iceland’s volcanic unrest intensified overnight as new fissures opened on the Reykjanes Peninsula, sending lava eastward and prompting fresh hazard warnings from officials. The eruption, centered ...

These rock drawings along Siberian rivers span a period of perhaps 20,000 years. They indicate connections among ancient peoples living as far apart as France and Japan ...