| A | B |
|---|
| gas giants | four outer planets - Jupiter, Saturn, Uranus, and Neptune- are much larger than Earth and do not have solid surfaces |
| asteroids | objects that revolve around the sun that are too small and too numerous to be considered planets |
| meteoroid | A chunk of rock or dust in space |
| meteor | A streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere. |
| meteorites | A chunk of rock or dust that hits the Earth's surface. |
| comet | A chunk of ice and dust whose orbits are usually very long, narrow elipses. |
| asteroid belt | The area around the sun betwen the orbits of Mars and Jupiter. |
| extraterrestrial life | life on a planet other than Earth |
| Europa | one of Jupiter's moons |
| Venus | called Earth's "twin"; hottest planet |
| Earth | only planet with life |
| Mars | the red planet |
| Jupiter | the largest planet |
| Saturn | known for its rings |
| Uranus | spins on its side |
| Neptune | has a storm called "The Great Dark Spot" |
| Mercury | closest planet to the sun |
