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The law of conservation of energy, which states that the amount of energy in a system is constant. For questions about Earth's environment, see the climate-science tag instead.

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How does an expanding universe and a constant-density vacuum energy not violate energy conse... [duplicate]

As per the title. I'm probably thinking too naively in a classical way, but intuitively it seems to me that: the presence of vacuum energy at fixed density throughout all space and, an expanding uni …