| A | B |
|---|
| solar system | the sun and the objects that go around it |
| orbit | the path an object takes to move around in space |
| planet | large body of rock or gas that orbits the sun |
| asteriod | chunk of rock or other metal that orbits the sun |
| comet | large ball of ice and dust that orbits the sun |
| rotation | spinning of an object on its axis |
| axis | imaginary line that goes through the North and South Poles |
| revolution | movement of one object around another object |
| phases | different shapes that the moon has in the sky |
| lunar eclipse | when the Earth's shadow falls on the moon |
| solar eclipse | happens when the moon's shadow falls on the Earth |
| star | hot ball of glowing gases |
| 365 1/4 days | the total time it takes the Earth to circle the sun |
| 29 1/2 days | the time it takes for the moon to go through all of its phases |
