The Big Bang Theory vocab.

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Across
  1. 2. the lightest, simplest, and most abundant chemical element, atomic number 1
  2. 4. the scientific study of matter, energy, and celestial objects outside Earth's atmosphere, including planets, stars, galaxies, and the universe's origin and evolution
  3. 5. an American astronomer who transformed cosmology by proving the existence of galaxies outside the Milky Way and discovering that the universe is expanding
  4. 10. American radio astronomer
  5. 13. the faint, nearly uniform remnant glow of electromagnetic radiation filling all space, representing the earliest light in the universe released roughly 380,000 years after the Big Bang
  6. 16. a massive, gravitationally bound system consisting of stars, stellar remnants, interstellar gas, dust, and dark matter.
  7. 17. a colorless, odorless, tasteless, and inert noble gas
  8. 18. German-born theoretical physicist
Down
  1. 1. Nobel Prize-winning American physicist and radio astronomer
  2. 3. British astrophysicist and mathematician
  3. 6. the entire, continuous range of all possible frequencies of electromagnetic radiation, spanning from low-energy, long-wavelength radio waves to high-energy, short-wavelength gamma rays
  4. 7. the totality of all space, time, matter, and energy that exists
  5. 8. the narrow band of electromagnetic radiation that the human eye can detect, typically spanning wavelengths from about 380 to 750 nanometers.
  6. 9. the leading scientific explanation for the origin and evolution of the universe
  7. 11. a scientific instrument designed to disperse radiation—typically electromagnetic radiation like light—into a spectrum of its constituent wavelengths and record this data, often via a multi-channel detector or camera
  8. 12. the capacity to do work, cause change, or move matter, measured in joules
  9. 14. a fundamental astronomical phenomenon where light from an object moving away from an observer stretches to longer, redder wavelengths, indicating an expanding universe
  10. 15. he decrease in wavelength (and increase in frequency) of electromagnetic radiation, such as light, emitted by an object moving toward an observer