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" ... Remarkably, one of those consequences of a Universe with a cosmological constant — the form of dark energy that is best supported by the data, where the energy density of dark energy remains constant over time and throughout all of space — is that the temperature of the Universe does not go to zero. Instead, the Universe will be filled with a bath of extraordinarily low-energy radiation that will appear everywhere, but at an utterly minuscule temperature: ~10-30 K. (Compare that to the cosmic microwave background today, which is more like ~3 K, or some 1030 times hotter.) ... "
" ... The far distant fates of the Universe offer a number of possibilities, but if dark energy is truly a ... [+] constant, as the data indicates, it will continue to follow the red curve, leading to the long-term scenario described here: of the eventual heat death of the Universe. However, dark energy doesn't have to be a cosmological constant. ... "