| A | B |
|---|
| crater | a hole in the ground that is shaped like a bowl |
| gravity | the force that pulls things towards the center of the earth |
| orbit | to move around another object along a path |
| phases | the different shapes of the moon |
| planet | a body of matter that moves around the sun |
| revolve | to move around the sun (cause of the calendar year) |
| rotate | to spin on an axix (cause of day and night) |
| solar system | the sun and the planets |
| sun | the center of our solar system |
