| A | B |
|---|
| Astronomy | The science that studies outer space, stars, and planets |
| solar system | The sun and the planets and other objects that orbit the sun |
| Saturn | Gas giant planet with rings |
| Earth | Third rocky planet from the sun, only planet with known life |
| sun | star at the center of the solar system |
| moon | rock that orbits a planet, Earth has 1 moon |
| stars | Large bodies in space that use fusion reactions to send out light and other energy |
| outer space | empty regions between stars, planets, etc. |
| gravity | a force that causes all objects to pull towards each other |
| galaxy | a huge system of stars that is separated from other such systems |
| milky way | The galaxy we live in |
