Waves and the Universe

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Across
  1. 3. Dwarf The small dense star left behind after the Red Giant phase
  2. 4. A small, dull star with a very high density
  3. 7. An object in space emitting light from nuclear fusion
  4. 8. Hole An object so dense that nothing, not even light can escape
  5. 9. The change in wavelength of light that is moving away from the observer
  6. 11. A device that allows light to be split into its spectrum of colours
  7. 12. A star towards the end of its life emitting mostly red light
  8. 13. All of space classes as the Universe
  9. 14. The distance between two successive point on consecutive waves
  10. 16. A collection of stars in moving around a central point
Down
  1. 1. A massive explosion that can happen at the end of a stars life
  2. 2. The force of attraction between objects with mass
  3. 5. Life form from another world
  4. 6. A device for magnifying images of objects from a large distance away
  5. 10. Waves per second
  6. 15. A cloud of dust and gas in space