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 ...

Free to print My Little Book of Planets—a fun, free printable space mini book for kids to color, trace, and learn about planets, space vocabulary, and more! Looking for a simple and fun way to teach ...

Have an out of this world coloring pages with our free planet coloring pages. We have a bonus space coloring pages, and free ...

The International Astronomical Union (IAU) defined a dwarf planet in 2006 as a celestial body that orbits the Sun, is round in shape, but has not cleared its orbital neighborhood of objects of ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. Samantha Lawler, Assistant professor, Astronomy, ...

Swinburne University of Technology provides funding as a member of The Conversation AU. Our Solar System is a pretty busy place. There are millions of objects moving around – everything from planets, ...