| A | B |
|---|
| solar system | the sun,the nine planets and their moons, and other objects that orbit the sun |
| Earth | the third planet from the sun |
| satellite | an object that revolves around another object |
| revolution | the movement of an object around another object |
| orbit | the path of an object around another object |
| rotation | one full spin of an object around an axis |
| axis | an imaginary line through a spinning object |
| gravity | a force that pulls any two objects toward one another, such as you toward the center of the earth |
| atmosphere | air that surrounds the earth |
| planet | a large body of matter that moves around a star such as the sun |
| core | the center part of the earth |
| mantle | the middle part of the earth |
| crust | the solid outside part of the earth |
| moon | a natural satellite that orbits earth |
| phase | the shape of the lighted part of the moon |
