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Well, it applies in a very coarse-grained sense. You have to average over spatial volumes of some 250 Mio. light years:
https://en.wikipedia.org/wiki/Cosmological_principle#Observations
It's not a superfluid, but the "energy content" consists (according to nowadays "concordance model") of 30% of heavy particles ("cold"/"non-relativistic") (25% are "dark matter" made of yet unknown particles and about 5% is made up of the known standard-model particles). The remaining 70% is "dark energy", describable by a cosmological constant, which is the most enigmatic component.
https://en.wikipedia.org/wiki/Lambda-CDM_model
https://en.wikipedia.org/wiki/Cosmological_principle#Observations
It's not a superfluid, but the "energy content" consists (according to nowadays "concordance model") of 30% of heavy particles ("cold"/"non-relativistic") (25% are "dark matter" made of yet unknown particles and about 5% is made up of the known standard-model particles). The remaining 70% is "dark energy", describable by a cosmological constant, which is the most enigmatic component.
https://en.wikipedia.org/wiki/Lambda-CDM_model