Space

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Across
  1. 4. a group of stars, gases, and space dust, in the shape of a spiral
  2. 7. degree of hotness or coldness as measured on a scale
  3. 9. when two or more particles collide
  4. 11. a diagram of many stars, it shows the temperature and luminosity of the star
  5. 15. a cloud of dust and gas appears in many shapes and colors
  6. 16. an instrument for examining spectra
  7. 18. A group of stars, clouds of dust, and dust particles
  8. 20. the measure of the brightness of an object of the distance at which it is viewed
Down
  1. 1. a galaxy that contains the solar system
  2. 2. everything we can touch, feel, sense, measure, and detect, includes living things, planets, stars, galaxies, etc.
  3. 3. an explanation that shows the origin of stars, planets, and galaxies
  4. 5. a repeated variation in some measure
  5. 6. a unit to measure temperature
  6. 8. have no particular shape
  7. 10. any natural body outside of the earth's atmosphere
  8. 12. the amount of light received from the object
  9. 13. brightness level, light
  10. 14. older and give off less light than other galaxies
  11. 17. a ball of gas, light, and energy
  12. 19. the distance between two peaks of the wave