| A | B |
|---|
| planet | a large body which revolves around the sun |
| star | a ball of hot glowing gas |
| Inner planets | Mercury, Venus, Earth, Mars |
| Outer Planets | Jupiter, Saturn, Uranus, Neptune, Pluto |
| Gas Giants | Jupiter, Saturn, Uranus, Neptune |
| Orbit | the path of a planet around the sun |
| axis | the invisible pole around which the earth rotates |
| year | one revolution of the earth around the sun |
| The Red Planet | Mars |
| Galileo moons | Jupiter |
| Reflective telescope | uses mirrors |
| Refractive telescope | uses lenses |
| Shortest year | Mercury |
| Hottest temperature | Venus |
| The water planet | Earth |
| Asteroid belt | small rocks and ice blocks which orbit around the sun between Mars and Jupiter |
| largest planet | Jupiter |
| beautiful rings | Saturn |
| vertical rings | Uranus |
| Blue from Methane gas | Neptune |
| Smallest planet | Pluto |
| Waning Moon | light gets smaller |
| Waxing Moon | light gets larger |
| phases | the changes in the moon's appearance during the month |
| rotation | spinning on an axis |
