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The universe refers to the cosmos; all of space-time and that which exists as part of it. Alternatively, it can refer to the observable universe, which only contains the part we can see. Questions tagged with this should ask about physics at scales the size of the universe or specific properties of the universe

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moving in the FRW universe with some velocity will lose its velocity. As velocity is not commonly used in GR, it is better to talk in terms of energy: a free particle in FRW experiences energy loss due … to universe growing. This is the reason for the cosmological redshift, when you apply this method to light particles (that travel on null geodesics). So, to conclude: in this particular frame we can …
answered Mar 18 '17 by Salvatore Baldino