Planet Party

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Across
  1. 2. A controversial dwarf planet
  2. 4. The name early astronomers gave to the distance between the Sun and Earth (abbreviated)
  3. 7. The red planet
  4. 9. The closest planet to the Sun
  5. 11. A tool that increases the size and details of the planets
  6. 12. The windiest planet
  7. 15. The measurement of how much a light a planet reflects
  8. 16. A number greater than any countable number
  9. 17. Has no known natural satellite
  10. 18. The only object in the Universe known to harbor life
  11. 20. Astronomers who write the rules for being a planet (abbreviated)
Down
  1. 1. Circle of animals
  2. 3. The jewel of the Solar System
  3. 5. Known for its Great Red Spot
  4. 6. The curved path of a celestial object or spacecraft around a star, planet, or moon
  5. 8. The path of the Sun and the plane of the Solar System. The planets never stray far
  6. 10. A planet that orbits a star outside our solar system
  7. 13. Wandering star
  8. 14. This planet spins on its side
  9. 19. An imaginary line about which a body rotates