Exploring the universe

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Across
  1. 2. Gas and dust condenses into this prior to star formation
  2. 4. What our sun will become once all the hydrogen is gone
  3. 7. A formation of stars in the night sky
  4. 8. The angle around from due North
  5. 9. Provides evidence that the universe is expanding
  6. 10. The imaginary central point in the night sky that the stars appear to rotate around
  7. 12. Ejection of matter at the end of a medium-sized star's life
  8. 14. The brightness of a star as it appears from Earth
  9. 15. Very hot, short lived star
  10. 17. Angle above the horizon
  11. 19. Our sun will become this once fusion has finished
  12. 21. The unit used to measure distance in space
Down
  1. 1. Main gas that stars are composed of
  2. 3. Explosion at the end of a massive star's life
  3. 5. The actual brightness of a star
  4. 6. Final stage of a supermassive star's life
  5. 11. The path that the sun, moon and planets take across the sky
  6. 13. Theory that proposes the universe is constant
  7. 16. Theory that proposes the universe is expanding
  8. 18. A cloud of dust and gas in space that forms a star
  9. 20. The process by which hydrogen turns into helium