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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.

Meteor Over Stonehedge, England

A NASA Hubble Space Telescope composite image shows the positions of comet Siding Spring and Mars as the comet streaked by the red planet, at 2:28 p.m. EDT on Oct. 19, 2014.

Halley's Comet: An image of Halley's Comet taken in 1986.

Vesta, more than an asteroid. Indeed, almost a planet

Color image of Comet ISON on October 27, 2013. Credit and copyright: Damian Peach.