Fastest stars in Milky Way are 'runaways' from other galaxy
Cambridge University researchers have found the fastest-moving stars in the Milky Way are in fact runaways from the Large Magellanic Cloud, a dwarf galaxy. LMC orbits the Milky Way at 400 km/sec, hence the stars ejected along its orbit have an added velocity and can also escape Milky Way. Researchers hope to locate such hypervelocity stars using ESA's Gaia satellite.