Astronomy

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Across
  1. 5. a physical quantity expressing the amount of matter in a body
  2. 6. dark ditch
  3. 8. magnification tool
  4. 12. time period before sunrise and after sunset
  5. 13. genderbent santa
  6. 14. System of stars
  7. 16. theory of the origin of the universe
  8. 17. powerful explosion of a star
Down
  1. 1. grouping of stars associated with mythology
  2. 2. space flying machine
  3. 3. the gaseous envelope surrounding the Earth or any celestial body
  4. 4. small rocky object orbiting the Sun
  5. 5. flying rock around Earth
  6. 7. nearby galaxy
  7. 9. celestial body of gas
  8. 10. subatomic particle with symbol “n”
  9. 11. unit of space travel
  10. 13. Cloud of dust and gas
  11. 15. an imaginary line that an object rotates around
  12. 18. space agency