Astronomers think, that there are dozens of billions undetectable free floating planets that straggle along our Milky Way galaxy, being not gravitationally bound to any star. Moreover, there are about two dozens known stars that escaped from our Galaxy at high velocities, and even one runaway star cluster hosting a million stars that fled the giant galaxy Messier87 in the Virgo cluster.
An artwork demonstrates several stages of the process of a close three-body encounter with a gravitation kick of a compact elliptical galaxy that explains the phenomenon of an isolated compact elliptical galaxy.
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