Submitted by Pristine_Pop_7818 t3_11w9asm in askscience
mfb- t1_jcyv2ko wrote
Reply to comment by BlueParrotfish in If the universe is constantly expanding, how is the law of conservation of energy obeyed? by Pristine_Pop_7818
> In practice, this means that dark-energy density is constant.
We don't know if it is, that's just the easiest model.
A more well-studied example is the cosmic microwave background which loses energy from the expansion.
BlueParrotfish t1_jcyvcog wrote
Yes, that is true. Thanks!
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