NATHAN RICH / NRL / NASA STEREO / CIRC / SCIENCE PHOTO LIBRARY NATHAN RICH / NRL / NASA STEREO / CIRC / SCIENCE PHOTO LIBRARY
Comet ISON approaching the Sun, with Earth in the background (top right). This series of images was taken by the STEREO A (ahead) spacecraft, between 21st-25th November 2013. At this point, Comet ISON was some two days from its perihelion, its closest approach to the Sun, and had already developed a prominent tail. ISON is a sungrazing comet, and passed within 1.2 million kilometres of the surface of the Sun. The encounter left little visible of the comet, although a small fragment is thought to have survived. This sequence coincidentally shows another comet, the periodic Encke, moving from top centre to lower right.
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