Space

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Across
  1. 2. people the go out into space
  2. 4. astronomer who discovered Jupiter
  3. 5. these orbit planets
  4. 6. astronomer who believed earth was the center
  5. 9. the closeness of particles in the air
  6. 10. largest planet
  7. 11. created a diagram of geocentric universe
Down
  1. 1. layer of air that protects a planet
  2. 2. people that study space
  3. 3. believed the heliocentric universe
  4. 7. planet with rings around it
  5. 8. a force that pushes things towards the center