A chunk of frozen rock and ice about the size of a mountain is moving toward the sun. Some Russian astronomers discovered the comet called ISON on Sept. 21, 2012. By Nov. 5, they estimated it was racing toward the sun at nearly 45 kilometers per second.The comet accelerates as it approaches the sun. Astronomers predict the comet will reach its closet point to the sun by the end of November.
Written by Adela Otero and María Pol