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