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October 1, 2007
A CME strikes Comet Encke.
The Sun Rips Off a Comet's Tail (NASA Feature)

Comet Encke never knew what hit it. On April 20, 2007, the comet had just dipped inside the orbit of Mercury, perilously close to the sun, when a solar eruption struck and literally tore the comet's tail off. This surely has happened to comets before, but for the first time in history a spacecraft was watching. NASA's STEREO-A probe recorded a fantastic movie of the collision.

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  Image Credit: NASA

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