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The Streak - Comet Siding Spring flashes across the sky impressively in this infrared image. Observers in Australia discovered the comet, also known as C/2007 Q3, in 2007.

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.

♥ Power of sky (Younés Ahlafi)

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.

IC 1396: Emission Nebula in Cepheus Image Credit: Digitized Sky Survey, ESA/ESO/NASA FITS Liberator

Comet Tuttle - Giampaolo Salvato photographed Comet Tuttle on Dec. 30, 2007 as it appeared near the spiral galaxy M33. The image was taken from northern Italy with a backyard telescope and a digital camera.

Comet Lovejoy is visible near Earth's horizon in this nighttime image photographed by NASA astronaut Dan Burbank, Expedition 30 commander, onboard the International Space Station on Dec. 22, 2011.

Individual images taken of Venus in one year to create a full curve. The summer solstice being at the top, winter solstice at the bottom, and equinox where they lines cross. - Imgur