| A | B |
|---|
| revolution | movement of one object around another |
| orbit | path an object takes around another object |
| asteroid | chunk of rock or metal that orbits the sun |
| lunar eclipse | result of Earth's shadow falling on the moon |
| phases | different shapes the moon seems to have |
| solar system | sun and objects that orbit around the sun |
| axis | imaginary line that goes through the North Pole and South Pole |
| planet | large body of rock or gas that orbits the sun |
| rotation | spinning of an object on its axis |
| solar eclipse | result of the moon's shadow falling on the Earth |
| comet | large ball of ice and dust that orbits the sun |
| Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto | the nine planets in the solar system in order from the sun |
| rocky on the surface | all inner planets are |
| sun's gravity | causes the objects in the solar system to stay in orbit |
| rotate | Earth takes on day to |
| seasons | caused by the tilting of the Earth's axis |
| rotation | the moon seems to move in the sky each night because of Earth's |
| frozen gas | the outer planets are made mostly of |
| the moon is visible | during a lunar eclipse and a new moon |
| a new moon happens | when the moon's lighted half faces away from the earth |
| describes the inner planets | smaller, warmer, closer to the sun |
| both the inner and outer planets | orbit the sun |
| describes the outer planets | larger,except for Pluto, colder, most have more moons |
