Big Picture: Comet ISON ploughs on toward Sun

Comet ISON images

Comet ISON continues to foreshadow its close pass of the Sun later in the year - Hawaii's Gemini Observatory snapped these images of ISON crossing the sky in early February, March, April and May. It will pass within 1.2m km of the Sun in November, and could be the "comet of the century" if it does not burn up entirely on the way.

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