big bang crossword

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Across
  1. 3. the simplest and most abundant chemical element
  2. 4. a very light, colorless, and odorless gas
  3. 6. caused by an object moving toward an observer
  4. 7. British astronomer
  5. 8. a massive, gravitationally bound system
  6. 9. a pioneering American astronomer who proved that other galaxies exist outside our Milky Way
  7. 10. the ability to do work
  8. 12. the scientific study of everything in the universe
  9. 15. an American physicist
  10. 16. the leftover heat from the Big Bang
  11. 17. American experimental theater director
Down
  1. 1. the leading explanation for how the universe began
  2. 2. the narrow range of electromagnetic radiation
  3. 5. the entire range of all possible frequencies
  4. 11. German-born physicist
  5. 13. everything that exists
  6. 14. the stretching of light waves from an object
  7. 18. an instrument that splits light