terrible space quiz

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Across
  1. 3. A YEAR OF LIGHT
  2. 4. E!=M^2C
  3. 6. STARS STARS CENTER
  4. 9. THIS IS DARK AND MATTERS
  5. 11. SPIN SPIN SPIN
  6. 12. FORCE
  7. 13. VECTOR = DIRECTION + ??
  8. 15. HE CAN NOT TALK WITH HIS MOUTH
  9. 17. he probably did something
  10. 18. THE RED SEEMS TO HAVE SHIFTED
  11. 20. THINGS MOVE MORE OR LESS BASED ON DISTANCE
  12. 21. THIS ONE IS EDIBLE TOO
Down
  1. 1. JIMMY
  2. 2. IN DE BENINGING
  3. 5. space + time
  4. 7. I POVITED TESTED FOR BOVID
  5. 8. WHO KNOWS WHAT THIS ONE IS DOING
  6. 10. THIS ONE COULD HAVE KILLED BUT WAS TOO WEAK
  7. 14. THIS ONE IS COOL AND MAKES STARS
  8. 16. STARS STARS STARS STARS
  9. 19. humble misspelled