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These images from NASA's Spitzer Space Telescope of Comet ISON were taken on June 13, 2013, when ISON was 312 million miles (502 million kilometers) from the sun. The lefthand image shows a tail of fine rocky dust issuing from the comet, blown back by the pressure of sunlight. The image at right shows a neutral gas atmosphere surrounding ISON, likely created by carbon dioxide fizzing off the comet at a rate of 2.2 million pounds per day.
The Crab Nebulae a supernova that was first observed by Indian, Arabic, Chinese and Japanese astronomers as a new "star" in the sky on July 4, 1054. The supernova was visible to the naked eye for about two years after its first observation. It was happened the same time and year of the Great Schism of the Catholic church. Crab Nebulae is currently expanding again.