A mysterious cold spot in space might be evidence of a parallel universe. Scientists have long been looking for an explanation for the strange, dark area in the cosmic microwave background – the radiation leftover from the big bang. A range of different explanations have been proposed, but the main one isn't likely to make sense and it could actually be a parallel universe. More specifically, the area could be the consequence of a collision between two different universes. It might be the first ever evidence of the theory of the multiverse – that there are billions of other universes, some of them just like our own, lurking outside the one that we can see.

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