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 ...

We have just entered a very favorable period for observing the so-called "elusive" planet Mercury. From now, until about May 13, you should be able to find it with not much difficulty. But how well do ...

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.

The Planet Parade of 2025 is a truly extraordinary celestial event that has stargazers excited. From January 21 to mid-February, six planets will align in the sky: Venus, Mars, Jupiter, Saturn, Uranus ...

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 ...

Perspective by Philippe Cousteau Jr. Kids and nature: Two things that not so long ago went together, well, naturally. Exploration outdoors defined childhood, which meant endless opportunities to ...