Our Place in Space

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