To combat an expanding universe, aliens could hoard stars

Advanced civilizations might be wise to stock up on energy sources before they’re out of reach

an illustration of a Dyson sphere

STAR CATCHER  To prepare for an eventual energy shortage caused by the accelerating expansion of the universe, an ultrapowerful alien civilization could gather stars and capture their energy using hypothetical structures known as Dyson spheres, illustrated above.

Marc Ward/Shutterstock

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