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High-Speed Alien Fugitives Are Invading Our Milky Way

Rare hypervelocity stars tearing through the Milky Way galaxy are runaway suns that have escaped neighboring galaxies, according to research presented at this year’s National Astronomy Meeting in Hull, England.

Hypervelocity stars are travelling between 300 and 700 kilometers (186 and 435 miles) per second faster than our galaxy’s escape velocity. Only 20 cases have been confirmed so far, most of them late B‑type stars that are larger than our sun. There has been some debate around the origin of these breakaway stars. Scientists believed a portion of them might have been lobbed from the Milky Way’s central rotational center.