Comet of the Century? Sun-Grazing Comet ISON Explained (Infographic) (

Named after the International Scientific Optical Network, Comet ISON — officially designated "C/2012 S1 (ISON) — has the potential to be the most spectacular comet of the century. But it could also prove to be a dud. A critical moment will be perihelion passage, when the comet comes closest to the sun... Read more and view the infographic at