For more than a century, the idea that life might have arrived on our planet from elsewhere in the cosmos sat at the fringes ...

Earths, vast underground oceans of molten rock may be quietly doing the work of life’s first line of defense: generating ...

From Hoth’s frozen trenches to Starkiller Base’s icy mountains, Star Wars keeps coming back to snow planets. Here’s why ice ...

In the bigger picture, "down" could be defined as being below the plane of the solar system, which is known as the ecliptic.