Pluto

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Across
  1. 2. Pluto's moon named after the Greek goddess of night
  2. 4. Pluto's core was once _______
  3. 7. Pluto's moon named after a seven-headed monster
  4. 9. Pluto is hypothesized to have a _________
  5. 11. Pluto is this
  6. 12. named after ______ God of the underworld
Down
  1. 1. Discovered by _____ W. Tombaugh on February 18, 1930
  2. 3. Pluto and Charon are considered a ____________
  3. 5. Pluto's biggest moon
  4. 6. Pluto's _____ freezes and falls to the ground when Pluto is furthest from the Sun
  5. 8. Pluto's smallest moon
  6. 10. Pluto's moon named after an underworld river from Greek mythology