Description: The sun is an average size star and the center of our solar system. One of the things surrounding it is an asteroid belt, and the four planets inside that belt are called the inner planets.
Our Solar System: Outer Planets (100%)
Description: Jupiter, Saturn, Uranus, and Neptune are the outer planets of our solar system. There is a planetoid called Pluto out there, too!
The Universe (13%)
Description: The universe describes space and all of the planets, stars, galaxies, and other matter contained there. It is so big that some scientists believe that it might go on forever.
A Day on Earth (10%)
Description: As the Earth rotates, light from the sun hits different parts, giving us day and night. During its orbit, the Earth’s tilt on its axis also causes the two hemispheres to be different distances from the sun, and that gives us seasons.
Atoms: Protons, Neutrons, Electrons (5%)
Topic: Matter
Description: An atom is a tiny particle in matter, and atoms are made of protons, neutrons, and electrons. Some matter, like your body or your book, is made of lots of different kinds of atoms, but elements are made up of only one kind of atom.