| A | B |
|---|
| solar system | the sun, eight planets, and other celestial objects, such as comets and asteroids, that orbit the sun |
| star | an object in space that makes its own heat and light |
| rotations | turn on an axis - earth's is 24 hours |
| planet | a large body orbiting the sun or another star |
| gravity | a force that attracts objects to larger objects |
| axis | the imaginary line that goes through the center of the Earth |
| comet | a big piece of ice that orbits the sun |
| orbit | the oval-shaped path a planet follows as it revolves around the sun |
| atmosphere | gases that surround Earth or another planet or moon |
| moon | a natural satellite revolving around a planet |
| revolution | a planet's movement around teh sun - Earth's is about 365 days |
| asteroid | a large rock that orbits the sun, usually found between Mars and Jupiter |
| meteor | seen as a streak of light. A rock that tries to reach earth and other planets. Becomes a meteorite when it hits earth’s atmosphere. |
