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Intergalactic star
An intergalactic star, also known as a rogue star, is a star that is not located within a galaxy. These stars were a source of much discussion in the scientific community during the late 1990s and are generally thought to be the result either of galaxies colliding, or of a binary star pair travelling too close to a black hole (which can be found at the center of many galaxies).
==Discovery==
The common belief that stars exist only in galaxies was disproven in 1997 with the discovery of intergalactic stars. The first to be discovered were in the Virgo cluster of galaxies, where some one trillion are now surmised to exist.
The discovery of intergalactic stars addresses the "missing baryon problem"〔(【引用サイトリンク】url=http://www.space.com/17734-milky-way-galaxy-giant-gas-halo.html )〕—baryons being a class of subatomic particles including the protons and neutrons that make up the cores of the atoms in normal matter. The missing baryon problem is identified by many theories of formation and evolution of the universe, which point out that there should be many more baryons than those which have been found by scientists.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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