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](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/06/061918_EC_aliens-cosmic-preppers_feat.jpg?fit=860%2C460&ssl=1)
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.
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