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Hypervelocity stars (HVS) are a unique class of stars which are defined by their extreme velocities (around 1,000 km/s). In fact, they are moving fast enough to be gravitationally unbound to the Galaxy. They were first predicted in 1998 and are thought to be a result of three-body interactions between a binary star pair and a massive black hole (MBH) that resides in the galactic center. The first HVS was discovered in 2005 and there are now about 20 known HVS.

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