Researchers have found that Earth’s first oceans may not have been blue at all like today. Instead, they may have gleamed in ...

Scientists have discovered evidence that Earth's oceans were once green, hinting that this could be a marker of early life, ...

If you’re going to set a sci-fi movie on an alien planet, it’s a nice bonus if that planet actually exists. Or, at least, is ...

“As the point of highest elevation on the planet, it is natural that any alien may want to land there,” says Richard Murray. But our visitors don’t even need to land on the summit. Anywhere ...