Is energy always conserved?
Автор: Physics Girl
Загружено: 2016-03-15
Просмотров: 302215
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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?
Many thanks to Sean Carroll for his wonderful description of this question: http://www.preposterousuniverse.com/b...
More resources:
http://motls.blogspot.com/2010/08/why...
http://hyperphysics.phy-astr.gsu.edu/...
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