A binary main-belt comet

@article{Agarwal2017ABM,
  title={A binary main-belt comet},
  author={Jessica Agarwal and David C. Jewitt and Max J. Mutchler and H. Weaver and Stephen M. Larson},
  journal={Nature},
  year={2017},
  volume={549},
  pages={357-359}
}
Asteroids are primitive Solar System bodies that evolve both collisionally and through disruptions arising from rapid rotation. These processes can lead to the formation of binary asteroids and to the release of dust, both directly and, in some cases, through uncovering frozen volatiles. In a subset of the asteroids called main-belt comets, the sublimation of excavated volatiles causes transient comet-like activity. Torques exerted by sublimation measurably influence the spin rates of active… 
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