'Rock Comet' Used To Just Be An Asteroid | Video

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Sun-grazing asteroid Phaethon, has given away its true identity by showing its tail. NASA's STEREO spacecraft captured imagery of the asteroid ejecting dust between 2009 and 2012. This looped time-lapse shows the asteroid in 2009.

Credit: Li / Jewitt /Agarwal / NASA / STEREO

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