Comets languishing in the asteroid belt between Jupiter and Mars may not be quite as dead as once thought, according to research by astronomers at the University of Anitoquia in Colombia. "Imagine all these asteroids going around the sun for eons, with no hint of activity," said astronomer Ignacio Ferrin. "We have found that some of these are not dead rocks after all, but are dormant comets that may yet come back to life if the energy that they receive from the sun increases by a few percent."

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