| A | B |
|---|
| hottest planet | Venus |
| coldest planet | Pluto |
| largest planet; has a great red spot | Jupiter |
| planet with a surface like Earth's moon | Mercury |
| Which two planets do not have moons? | Mercury and Venus |
| Great Dark Spot | Neptune |
| Red Planet | Mars |
| solar system formed | 5 billion years ago |
| tilted orbit and most ellipitical | Uranus |
| ringed planets | Saturn, Uranus, Neptune |
| object with a glowing tail | comet |
| comet's tail always points | away from the sun |
| 4 parts of a comet | nucleus, coma, dust tail, ion tail |
| Oort Cloud | where comets come from |
| asteroid | large piece of rock in space |
| Asteroid Belt | located between Mars and Jupiter |
| Ceres | largest asteroid |
| meteoroid | meteor located in outer space |
| meteor | meteor in Earth's atmosphere |
| meteorite | meteor on the Earth's surface |
| Eccentricity | how oval like a planet's orbit is |
| Geocentric | idea that Earth was at the center of everything |
| Heliocentric | sun-centered solar system |
