Planet Party

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