© Kevin HeiderA picture showing the faint tail of the celestial body 596 Scheila, which was once thought to be an asteroid. Researchers now think it may be a dormant comet coming back to life
A huge asteroid discovered more than 100 years ago may not be an asteroid at all, but a dormant comet that is just now coming back to life, according to new observations.
The object, known as 596 Scheila, is about 70 miles (113 kilometers) wide and has a faint, wispy tail that suggests it may actually be a comet, researchers said. If that's the case, then 596 Scheila would be only the sixth known comet to reside in the main asteroid belt, a vast region of space rocks that lies between the orbits of Mars and Jupiter.
The asteroid-turned-comet discovery was somewhat serendipitous. On the night of Dec. 11, astronomer Steve Larson, a scientist with the Catalina Sky Survey in Tucson, Ariz., was searching for
potentially hazardous asteroids when he came across an object with a bright core and a faint tail.