inner planets

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Across
  1. 2. red planet
  2. 4. hottest planet
  3. 6. a terrestrial object in space
  4. 8. like our sun
Down
  1. 1. to go around something
  2. 2. a satellite that orbits a terrestrial object
  3. 3. smallest planet
  4. 5. empty
  5. 7. the place we live on
  6. 9. our light source