angTippiEli6zt angTippiEli6zt
  • 12-01-2017
  • Geography
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What evidence indicates that the universe is expanding?

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TionaDavis
TionaDavis TionaDavis
  • 12-01-2017
redshift and doppler effect
redshift is an increase in the wavelength of radiation emitted by a receding celestial object as a consequence of the Doppler effect and the Doppler effect is a tool used to measure frequency changes as light travels to, from, or pass an observer
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