space sciene

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Across
  1. 3. Small rocky body
  2. 4. Largest planet
  3. 7. Curved path an object follows around a larger object.
  4. 8. Force that pulls objects with mass toward each other.
Down
  1. 1. When a star runs out of hydrogen fuel in its core.
  2. 2. Smallest planet and closest to our system's central star.
  3. 5. Only planet known to have liquid oceans on its surface.
  4. 6. Gas giant with rings
  5. 9. Hottest planet because of its runaway greenhouse effect.