space!!!

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Across
  1. 4. 90% of stars are currently in this stage of their life cycle
  2. 7. a star that is among the most massive and brightest of all stars.
  3. 10. the pulling to the middle of the earth, causing things to fall
  4. 13. a huge system of billions of stars together
  5. 14. the extremely dense remains of a dead star, very small and desne
  6. 15. a chart that graphs a star's brightness and temperatuer
  7. 18. the planet in which we live on
  8. 20. a ring-shaped nebula formed by an expanding shell of gas around an aging star
Down
  1. 1. a young star in the early stages of formation; nuclear fussion
  2. 2. a celestial body that orbits around the sun
  3. 3. dwarf a dead star that no longer gives off light or heat
  4. 5. a smooth, circular or oval shaped galaxy
  5. 6. the name of the spiral shaped galaxy of which we live in
  6. 8. a random, scattered type of galaxies
  7. 9. a star that has exhausted all of its nuclear fuel; planet sized and very dense
  8. 11. an extremely bright explosion of a star
  9. 12. a flat, disk-shaped galaxy
  10. 16. the stage after a main sequence for a small to medium mass star; fuel begins to run out.
  11. 17. a main sequence star that lights up our earth
  12. 19. a huge cloud of dust and gas in space held together by gravity