Atronomy

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Across
  1. 2. Process that powers the sun and stars
  2. 4. Atoms with the same number of protons but different numbers of neutrons
  3. 5. Measurement of distance between stars
  4. 7. Theory that universe began with an explosion of energy
  5. 9. Pluto was classified as this in 2006
  6. 11. American astronomer who devised the term "black hole"
  7. 13. Study of the stars
  8. 16. Type of black hole
  9. 17. One of the rocky planets
Down
  1. 1. Largest planet
  2. 3. Waves that carry energy from an earthquake around the earthpositron / positively charged electron
  3. 5. Can't escape from a black hole
  4. 6. Force that causes all matter to collect together
  5. 8. One of the 5 dwarf planets
  6. 10. Collapsing cloud of gas that will become a star
  7. 12. Celestial body that is in orbit around the sun
  8. 14. Galaxy in which the solar system is located
  9. 15. Known as the Red Planet
  10. 17. Natural satellites that orbit planets