Natural News: If there are any advanced aliens out there, proposed a recently-published paper by an American researcher, they would be racing against the constant expansion of the universe that is caused by dark matter. An article in Live Science described how these aliens would go so far as to stealing stars from other galaxies before those systems drift out of their reach forever.
The reason for their haste is that the energy needs of their civilization would have reached the point where entire stars would only serve as temporary fuel sources for them. And there are only so many stars in a galaxy that are suitable for harvesting
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