The ancient Greeks proved over 2,000 years ago that the Earth was round and figured out how big it was by using simple observations of the Sun. But how do people know this today? When you drop ...

The worlds around our sun run the gamut from small and lifeless chunks of rock to gargantuan globes of gas. Our planet's siblings each have its own extreme features and crazy phenomena. -- Charles Q.

Venus is undoubtedly one of the weirdest planets in the solar system. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Venus, the second planet ...

The History Channel has announced the launch of Planet H, a brand extension targeting kids ages seven to 11 with educational content about history. Developed by History and its parent company, A+E ...