There may be 4 evil alien civilizations in the galaxy

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The Milky Way is home to millions of potentially habitable planets — and approximately four of them may harbor evil alien civilizations that would invade Earth if they could, new research posted to the preprint database arXiv (opens in new tab) suggests.

The new paper, which has not yet been peer-reviewed, poses a peculiar question: What are the odds that humans could one day contact a hostile alien civilization that’s capable of invading our planet?

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