vocab. words

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Across
  1. 3. Theory that the sun is the center of the universe.
  2. 6. When an object travels around another object.
  3. 7. Rotation of a planet or other space object around anothe
  4. 8. The line that a planet spins on.
  5. 10. a tool used to see space up close
  6. 11. the force holding us down
  7. 12. Theory that the earth is the center of the universe.
Down
  1. 1. someone who studies space
  2. 2. everything in space as a whole
  3. 4. The hole in a planet or moon from a space rock or object hitting the surface.
  4. 5. When a planet spins on its axis.
  5. 9. the study of space