What lies... be­yond the uni­verse?

Science Illustrated - - ASK US -

The uni­verse is much larger than what physi­cists can ob­serve – per­haps even in­fi­nite.

But even if the uni­verse is not in­fi­nite, noth­ing ex­ists be­yond its bor­ders, as in that case, the uni­verse bends into it­self, so to speak. The bend means that a trav­eller would in prin­ci­ple re­turn to his starting point, if he con­tin­ued long enough in the same di­rec­tion.

Per­haps our uni­verse is not the only one. If so, the uni­verse will be sur­rounded by other uni­verses – pos­si­bly an in­fi­nite num­ber in a mul­ti­verse. The idea of a mul­ti­verse is purely the­o­ret­i­cal, and the ex­is­tence of other uni­verses can prob­a­bly not be proved.

VIC­TOR DE SCHWANBERG/ SCIENCE PHOTO LI­BRARY

Out­side our uni­verse, there could be a mul­ti­verse, which might in­clude an in­fi­nite num­ber of uni­verses.

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