| A | B |
|---|
| star | a large mass of hot gases |
| Mercury | the planet closest to the sun |
| Mars | the red planet, 4th from the sun |
| Venus | the second planet, covered by clouds |
| Jupiter | the largest planet with 16 moons |
| Earth | the third planet; has air and water |
| Saturn | the 6th planet, with many rings |
| Pluto | the farthest and smallest planet |
| Neptune | the 8th planet; blue with 8 moons |
| Uranus | the 7th planet; it lies on its side |
| solar system | all the objects that move around the sun |
| orbit | the path around an object |
| phase | the shape of the lighted part of the moon |
| telescope | instrument;makes things look bigger |
| axis | an imaginary line going through the center of Earth |
| rotate | to spin on the axis; takes 24 hours |
| revolution | Earth moving around the sun; takes 365 days |
