In this modeled image of ISON, the coma has been subtracted, leaving behind the nucleus. Credit: Jian-Yang Li (Planetary Science Institute)

Ison-ratio-model-only

In this modeled image of ISON, the coma has been subtracted, leaving behind the nucleus. Credit: NASA, ESA, the Hubble Heritage Team (AURA/STScI) and Jian-Yang Li (Planetary Science Institute)

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