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Bright spots of varying sizes pop from a pitch-black background. These are galaxies and stars as seen through NASA’s Hubble Space Telescope. At the forefront, the biggest bright spot, which appears smeared, like it's moving down the image, is Comet ISON, which is streaking across the sky, enveloped by a dusty halo.

Comet

NASA's Hubble Space Telescope captured this image of comet ISON, wrapped in a dusty halo, streaking through the sky in April 2013. Credit: NASA/ESA/Hubble Heritage Team

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