space and stuff

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Across
  1. 3. a bright spot at night
  2. 5. they do astronomy and physics
  3. 10. egg
  4. 11. chocolate bar
  5. 12. there is nothing
  6. 13. nothing can escape it
  7. 15. its a rotating black hole
  8. 18. arcs of plasma around the sun
  9. 20. what is the universe doing
Down
  1. 1. the closest star to us
  2. 2. discovered that galaxies are moving away
  3. 4. how long a star has after it makes iron
  4. 6. bringing everyone together
  5. 7. the fasted bit of time measurement
  6. 8. it makes up approximately 85% of matter
  7. 9. bright, colourful and going out with a bang
  8. 14. a curved path of a celestial object
  9. 16. what stars create
  10. 17. where the big bang happened
  11. 19. bazinga