Till date, scientists knew of about two dozen runaway stars and found one runaway star cluster escaping its galaxy forever."These galaxies are facing a lonely future, exiled from the galaxy clusters they used to live in," said astronomer Igor Chilingarian from the Harvard-Smithsonian Centre for Astrophysics.An object is a runaway if it is moving faster than escape velocity which means it will depart its home never to return.

In the case of a runaway star, that speed is more than a million miles per hour.A runaway galaxy has to race even faster, travelling at up to six million miles per hour.Chilingarian and study co-author Ivan Zolotukhin from the Moscow State University initially set out to identify new members of a class of galaxies called compact ellipticals.These tiny blobs of stars are bigger than star clusters but smaller than a typical galaxy, spanning only a few hundred light-years.In comparison, the Milky Way is 100,000 light-years across.Compact ellipticals also weigh 1,000 times less than a galaxy like our Milky Way.

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