relationships in the universe

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Across
  1. 3. a system of millions or billions of stars
  2. 4. artificial body orbit a planet
  3. 8. a metric of length equal to 1,000 meters
  4. 9. describes how long a wave is
  5. 11. the planet we live in
  6. 13. event with potential to cause harm
  7. 14. type of astrophotography
  8. 17. the classification of living organisms
  9. 18. small rocky body
  10. 19. a body of ice and dust
  11. 20. used to measure the distance between planets
  12. 21. natural satellite of earth
  13. 22. massive self-luminous celestial body of gas
  14. 23. a tool astronomers use to see faraway
  15. 24. used to measure the distance between earth and sun
  16. 25. the rate of when something occurs
Down
  1. 1. emission of energy in space
  2. 2. small planet
  3. 5. a celestial body moving in a orbit of a star
  4. 6. collection of planets that orbit a star
  5. 7. a cloud of gas and dust
  6. 10. the force that pull objects together
  7. 12. includes all of spaces
  8. 15. the range of wavelengths or frequencies
  9. 16. a variation that transfers energy