PLUTO

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Across
  1. 2. Discovered in 1978, Pluto's biggest moon
  2. 3. Chosen as the name for the third moon because that mythological creature had 9 heads and Pluto is/was the 9th planet from the Sun
  3. 5. Most dense region of the Kuiper Belt
  4. 8. One of Pluto's smaller moons
  5. 9. How many moons does Pluto have?
  6. 11. Proposes that the impact of a large comet killed the dinosaurs
  7. 13. First mission to Pluto and the Kuiper Belt
  8. 14. The interior of Pluto is mainly made up of this element, but in different phases
Down
  1. 1. Discovered the Kuipper Belt
  2. 3. Discovered by English astronomer, developed in the Oort Cloud
  3. 4. A planet that hasn't become gravitationally dominant and it shares it's orbital space with other bodies of a similar size
  4. 5. The point at which the total mass of a body or system is assumed to be centered and upon which the sum of external forces can be considered to act
  5. 6. Developed because the debris was out of reach of Jupiter's gravitational pull
  6. 7. Largest Kuiper Belt object
  7. 10. Pluto's atmospheric composition is mostly made up of this
  8. 12. Discovered the Oort Cloud