Astronomy Vocab

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Across
  1. 4. Theory that states the sun is in the center of the solar system.
  2. 5. The study of space beyond our atmosphere.
  3. 9. A planet spins on its axis. Earth takes 1 day to complete it.
  4. 11. Theory that the Earth was the center of the universe.
  5. 12. A person who studies space.
Down
  1. 1. When an object travels around another. Earth takes 1 year to complete it around the sun.
  2. 2. A device used to make distant objects appear much closer.
  3. 3. An imaginary line going through the center of a sphere ´ s north and south poles.
  4. 6. The path of an object around another object in space.
  5. 7. A force that pulls object toward the center of the Earth, other planets or moons.
  6. 8. Everything in space as a whole.
  7. 10. A hole in the surface of a planet or moon caused by a rock in space hitting the surface.