Astronomy Unit by Dorothy and Demeya

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Across
  1. 2. main sequence star
  2. 5. a cloud of gas and dust where stars form
  3. 7. the type of radiation waves in spiral galaxies
  4. 10. when a object in space moves away from us its light waves are stretched into lower frequencies
  5. 11. what scientists believed how the universe form
  6. 12. clusters of stars
  7. 13. galaxies have an oval/elliptical shape
  8. 15. rays with shorter wavelength and higher frequency/energy
Down
  1. 1. brightness of stars
  2. 3. rays used for sunscreen or tanning
  3. 4. the center of the milkyway
  4. 6. galaxies that have spiral arms
  5. 8. Our Galaxy
  6. 9. Year the distance light travels in a year
  7. 14. galaxies have an irregular shape