Centaurs: NASA's WISE finds mysterious centaurs may be comets

Centaurs: NASA's WISE finds mysterious centaurs may be comets: " The true identity of centaurs, the small celestial bodies orbiting the sun between Jupiter and Neptune, is one of the enduring mysteries of astrophysics. Are they asteroids or comets? A new study of observations from NASA's Wide-field Infrared Survey Explorer (WISE) finds most centaurs are comets."