Sgr A: Fast Stars Near the Galactic Center . ... ESO Explanation: Why are these stars moving so fast? Shown above is a time-lapse movie in infrared light detailing how stars in the central light-year of our Galaxy have moved over the past eight years. ... If these fast stars are held to the Galactic Center by gravity, then the central object exerting this gravity must be both compact and massive. ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...