Tags: Star.
SDSS J090744.99+024506.8 (SDSS 090745.0+024507) is a star that is leaving the Milky Way galaxy at twice the galactic escape velocity (0.002 the speed of light). Christened by the astronomer Warren Brown as the Outcast Star it is the first discovered member of a class of objects named hypervelocity stars.It was discovered at the MMT Observatory of the Harvard-Smithsonian Center for Astrophysics (CfA) by astronomers Warren Brown Margaret J. Geller Scott J. Kenyon and Michael J.