Space

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Across
  1. 1. A rocky, airless remnant.
  2. 6. Rocky or gas giants that orbit a star.
  3. 8. Many planets and solar systems.
  4. 9. A really, really, really bright, powerful supernova.
  5. 10. Celestial bodies that orbit a planet.
Down
  1. 2. The explosion of a star.
  2. 3. Closest planet to the sun.
  3. 4. Many believe is a planet.
  4. 5. Icy balls of dust.
  5. 7. Giant balls of hot gas.