ISON, Encke, Mercury, and Home

ISON, Encke, Mercury, and Home
ISON, Encke, Mercury, and Home On November 21, 2013, comet C/2012 S1 (ISON) entered the field of view of NASA's STEREO "Ahead" spacecraft's HI-1A camera. It joined Earth, Mercury and comet 2P/Encke! Karl Battams / NASA-CIOC

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