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An intergalactic star, also known as an intracluster star or rogue star, is a type of star that is not gravitationally bound to any galaxy. Although a source of much discussion in the scientific community during the late 1990s, intergalactic stars are now generally thought to have originated in galaxies like other stars, but later expelled as the result of either colliding galaxies or of a multiple star system travelling too close to a supermassive black hole, which are found at the center of many galaxies.

Discovery[]

It was common belief that stars only existed in galaxies, until 1997 when an intergalactic star was discovered. The first to be discovered were in the Virgo cluster of galaxies, where some one trillion are now surmised to exist.

Known intergalactic stars[]

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