Back to Article List Astro for Kids: Why are planets round? Gravity, mass and centrifugal force all contribute to the final shape of a planet.

That’s why Pluto lost its status as a planet and is now classified as a dwarf planet. It failed the final item on the checklist – other icy Kuiper belt bodies are within its orbital path.

Curious Kids is a series for children of all ages. Have a question you’d like an expert to answer? Send it to . “Comet,” “star” and “planet” are category names that immediately tell ...

5 planets, moon to align in rare ‘Parade of Planets’ by: Brantly Keiek Posted: Jun 20, 2022 / 04:45 PM CDT Updated: Jun 24, 2022 / 03:49 PM CDT ...

Mercury is putting on a show for skywatchers in the evening sky after sunset. But how well do you know the planet Mercury? Here's some Mercury trivia to ponder while planet gazing.

Our solar system's planets vary greatly in size, composition, temperature, chemistry and geology. Here are some notable extreme facts about the planets that orbit our Sun.

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 ...

Discover interesting facts about Mars, its moons, its atmosphere, and the possibilities of life.