Unit #1: The Universe

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Across
  1. 4. | Leftover heat energy from the Big Bang |
  2. 5. | The part of the electromagnetic spectrum humans can see |
  3. 10. | A shift of light toward the red end of the spectrum when objects move away |
  4. 14. | Matter that cannot be seen directly but affects objects through gravity |
  5. 15. | An element formed shortly after the Big Bang |
  6. 17. | A huge group of stars, gas, and dust held together by gravity |
  7. 19. | All forms of electromagnetic radiation, including visible light, radio waves, and X-rays |
  8. 20. | A galaxy with spiral arms rotating around a center |
  9. 21. | The astronomer who discovered galaxies beyond the Milky Way and evidence of expansion |
  10. 22. | A rounded or oval-shaped galaxy mostly made of older stars |
  11. 23. | The theory that the universe began from a hot, dense point and expanded |
  12. 24. | The observation that galaxies are moving farther apart over time |
  13. 26. | The number of waves passing a point each second |
  14. 29. | Dark lines formed when atoms absorb specific wavelengths of light |
Down
  1. 1. | A region in space where gravity is so strong that light cannot escape |
  2. 2. | Dark absorption lines seen in the Sun’s spectrum |
  3. 3. | A hypothetical collapse of the universe back into a single point |
  4. 6. | A complete range of colors without gaps |
  5. 7. | The distance between matching parts of a wave |
  6. 8. | A mysterious energy believed to cause the universe’s expansion to speed up |
  7. 9. | Everything that exists, including space, time, matter, and energy |
  8. 11. | A small galaxy containing fewer stars than large galaxies |
  9. 12. | The lightest and most common element in the universe |
  10. 13. | A galaxy with no clear shape |
  11. 16. | The change in wave frequency caused by motion between objects |
  12. 18. | Bright lines produced when atoms release energy |
  13. 20. | The range of colors or wavelengths produced when light is separated |
  14. 25. | A transparent object that separates light into colors |
  15. 27. | The idea that galaxies farther away move away faster |
  16. 28. | The distance light travels in one year |