Big-Bang-Theory Vocabulary

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Across
  1. 2. The simplest, lightest, and most abundant nonmetallic chemical element, consisting of one proton and one electron
  2. 4. The branch of science that deals with celestial objects, space, and the physical universe as a whole
  3. 5. A pivotal 20th-century American observational astronomer who established the field of extragalactic astronomy.
  4. 10. Prominent scientists
  5. 13. Is the faint, nearly uniform relic electromagnetic radiation left over from the Big Bang, representing the earliest light in the universe.
  6. 16. A massive, gravitationally bound system consisting of stars, stellar remnants, interstellar gas, dust, and dark matter
  7. 17. The chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series.
  8. 18. German-born theoretical physicist.
Down
  1. 1. German-American radio astronomer and Nobel laureate
  2. 3. Prominent British astrophysicist and mathematician
  3. 6. The entire range of all possible frequencies, wavelengths, and photon energies of electromagnetic (EM) radiation
  4. 7. All existing matter and space considered as a whole
  5. 8. The visible light spectrum is the narrow band of electromagnetic radiation, typically between 380 and 750 nanometers.
  6. 9. Is the prevailing cosmological model explaining that the universe expanded from an extremely hot, dense state approximately 13.8 billion years ago.
  7. 11. An apparatus for photographing or otherwise recording spectra
  8. 12. The capacity to do work, cause change, or move matter, measured in joules
  9. 14. Where electromagnetic radiation (such as light) from an object is stretched to longer, redder wavelengths because the source is moving away from the observer.
  10. 15. The decrease in wavelength (and increase in frequency) of electromagnetic radiation (such as light) emitted by an object moving toward an observer.