Inner Planets

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Across
  1. 3. probe is a spacecraft
  2. 6. is the third Planet
  3. 7. has almost no atmosphere
  4. 8. Planets have rocky surfaces
Down
  1. 1. has seasons
  2. 2. is a large round object
  3. 4. is the second Planet
  4. 5. is the first Planet
  5. 7. is a natural object