Explore our solar system's planets- more specifically what planets are made of, and how they are formed.

Understand that smaller parts make up the larger parts of our solar system. See that gas and dust come together to form a star, small rocks and asteroids come together to form planets, and so on. This page is a reference page that...

Start with the questions all students ask: How big is the universe, how far away are the planets and stars, how did they form and when, how do they move and why? Build on their natural curiosity. The Smithsonian, in cooperation with...