space unit

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Across
  1. 4. A grouping of millions or billions of stars,gas, and dust, held together by gravity
  2. 5. A distinctive star grouping that is not one of the 88 recognized constellations
  3. 7. Enormous explosion that marks the death of a massive star
  4. 8. Space model with the sun in the center
  5. 9. A big change in the frequency of sound, light, and other waves
Down
  1. 1. Telescopes that are used to observe the cosmos with the use of lenses
  2. 2. Used to measure the spectrum of a star.
  3. 3. Object around which gravity is very intense
  4. 5. The height of a celestial body above the horizon, ranging from 0 at sea level to 90° straight up
  5. 6. Space model with earth in the center