Space vocabulary

4. The movement of one object around another object in space. Earth makes one revolution around the Sun in about 365 days
6. A force of attraction between objects. Gravity keeps planets in orbit around the Sun and keeps the Moon in orbit around Earth.
10. The tendency of an object to keep moving in the same direction and at the same speed unless a force changes its motion.
11. The four planets farthest from the Sun They are much larger and made mostly of gases and/or ice.
12. A piece of a space rock that survives its trip through Earth's atmosphere and reaches Earth's surface.

1. An oval-shaped path that an object follows as it moves around another object in space.
2. A unit used to measure distances in our solar system. One of these is about the average distance from Earth to the Sun.
3. The four planets closest to the sun They are small, rocky, and have solid surfaces.
4. The spinning of an object around its axis. Earth completes one rotation about every 24 hours.
5. A space rock that enters Earth's atmosphere and burns, creating a bright streak of light in the sky.
7. A rocky object that orbits the Sun. Most asteroids are found in the asteroid belt between Mars and Jupiter.
8. An object made mostly of ice, dust, and rock that orbits the Sun. When it gets close to the Sun, it can form a glowing tail.
9. A bowl-shaped hole on the surface of a planet, moon, or other space object, usually formed by an impact.