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Physics Girl: Season 2016

2016x07 Is energy always conserved?
TV-G

  • 2016-03-15T04:00:00Z on YouTube
  • 5m
  • United States
  • Documentary
When light passes through the universe and is redshifted by the expansion of space itself, how is energy conserved? The stretched light has a longer wavelength and therefore a lower energy. Is energy conserved? If so, where does it go?
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