The Universe

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Across
  1. 4. shorter wavelength
  2. 6. cloud of gas and dust
  3. 9. to swing or move regularly back and forth
  4. 13. universe rapidly expanded
  5. 14. explanation of a phenomenon
  6. 15. fireball
Down
  1. 1. force that repels gravity
  2. 2. BigBang and BigCrunch
  3. 3. longer wavelength
  4. 5. the cosmos
  5. 7. study of the origin and evolution of the universe
  6. 8. earliest stage, no matter existed
  7. 10. remnants of bigbang
  8. 11. proposed the oscillating universe
  9. 12. era:atomic, galactic, stellar