Astronomy

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Across
  1. 3. The study of space and celestial objects
  2. 6. The planets travel in an ________ around the sun
  3. 8. A chunk of rock broken off of an asteroid
  4. 9. Form of measurement using triangles
  5. 11. When a meteor collides with the Earth's surface
  6. 12. A large mass of rock in orbit around the sun
  7. 13. Believing the Earth is the center of the universe
Down
  1. 1. The Earth spins on its invisible ______.
  2. 2. system There are eight planets in our solar system
  3. 3. unit 149,597,871 kilometers in the world of astronomy
  4. 4. Saturn's biggest _______ is Titan
  5. 5. Believing the sun is the center of the universe
  6. 7. motion The apparent motion of a planet to travel backwards compared to other bodies within its system.
  7. 10. When a meteoroid enters the Earth's atmosphere