# Where does energy go in the death of the Universe?

So I thought that energy can't be destroyed or created but can only be transformed into another kind of energy. I read something about the Universe dying because all the stars will burn out and the Universe will "die due to hypothermia". Now, if there isn't any thermal energy left, where will all the energy have gone?

• The energy doesn't disappear, it just gets diluted away as the universe expands i.e. the energy per cubic metre decreases asymptotically towards zero. – John Rennie Jun 14 '16 at 17:19
• And from what John said, this is because of the 2nd law of thermodynamics, which states: That heat cannot flow from a cold system to a warm system without work, and since work requires movement of energy Q, these equations might be informative. $$dS = \frac{dQ}{T}$$ $$\frac{dS}{dQ} = \frac{1}{T}$$ – user97261 Jun 14 '16 at 17:33
• sounds like you know what you're saying. Thanks for informing me :) – Alex Jun 14 '16 at 18:13