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The universe (supposedly) is not exchanging any energy or matter with something outside of the universe, therefore being isolated. Yes energy and matter exchanges happen within, but within the universe as a whole, no energy would be lost to something outside.
The universe does not exchange matter or energy with anything surrounding it (as far as I know), which is why it fits the definition of an isolated system. I don't think it is a closed system because there isn't any surrounding to exchange energy with.
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