Stars and such

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Across
  1. 2. The constelation that looks like a "W"
  2. 3. Look down
  3. 6. An object's resistance to change in motion
  4. 9. The dragon constelation in between Ursa Major and Ursa Minor
  5. 11. A massive cloud of dust that may become a star
  6. 12. An incredibly dense body of mass that suck in everything
  7. 15. Earth is a _
  8. 16. Commonly known as the Big Dipper
  9. 22. A very famous telescope
  10. 23. NASA space probe launched in 1977
  11. 24. The path an object takes around a planet or celestial body
  12. 26. The amount of time it takes for the ISS to complete a full orbit around the Earth
  13. 27. A well known belt of asteroids
  14. 28. Sometimes called the ISS
Down
  1. 1. The distance light travels in a year
  2. 4. The constellation that contains Polaris
  3. 5. Greek princess saved by Perseus
  4. 7. A massive collection of stars and planets
  5. 8. The first element on the periodic table
  6. 10. Closest star to our solar system
  7. 13. The amount of matter in an object
  8. 14. The center of our solar system is a _
  9. 17. An object orbiting a larger object
  10. 18. The hunter constellation, Identifiable by his belt
  11. 19. Often refered to as "The North Star."
  12. 20. A group of stars in the sky, often representing figures
  13. 21. The force that holds us to Earth
  14. 25. The galaxy we live in