Astronomy

Ralph G.
5 words 2 learners

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Full list of words from this list:

words only definitions & notes
  1. galaxy
    a collection of star systems
  2. star
    a celestial body of hot gases that radiates energy
  3. red shift
    (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding
  4. Doppler
    Austrian physicist famous for his discovery of the Doppler effect (1803-1853)
  5. light year
    the distance that light travels in a vacuum in 1 year
Created on Fri Jul 29 11:17:13 EDT 2011

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