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Or the night skies light up completely because there was another big bang somewhere else and the light from that universe cluster just reached us

our observable universe may be around an unobservable area whose light hasn't reached us yet

so a parallel universe somehow interferes with ours? I don't think even most enthusiastic multiverse theorists will be able to grasp that.

not really parallel like alternate dimensions, maybe adjacent to not get distracted by colliqualisms and scifi tropes?

just another area in the vast void that also had a big bang which is outside of our observable area right now, but whose light may reach us one day.