Universe Crossword

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Across
  1. 3. what can be seen from Earth
  2. 5. the force causing expansion of the Universe
  3. 6. particle of light
  4. 8. fastest thing in the Universe
  5. 9. being unable to prove false
  6. 10. first light in the universe (3 words)
  7. 14. space and time thought of as one
  8. 16. four forces that govern the Universe (2 words)
  9. 17. everything--time, space, energy, matter
  10. 18. discovered that distant galaxies redshift more than nearby ones
Down
  1. 1. unit of distance and defined by light
  2. 2. the era we live in
  3. 4. explains how the Universe was born
  4. 7. not infinite
  5. 11. study of the Universe
  6. 12. the Universe is __ in its expansion
  7. 13. time the the very distant future
  8. 15. a force that holds bodies together