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Comet ISON streaming towards the Sun. At its closest approach on Thanksgiving Day 2013, it will be just 730,000 miles above the sun's surface. (Image Credit: ESA/NASA/SOHO) This image comes from SOHO, the Solar and Heliospheric Observatory - the comet is in the lower right. Mona Evans, "Comets"

Bright, brighter, brightest: these views of Comet ISON after its closest approach to the sun Nov. 28 show that a small part of the nucleus may have survived the encounter. Images from the Solar and Heliospheric Observatory. (Credit: ESA/NASA/SOHO/GSFC) Mona Evans, "Comets"

from Etsy

Vintage Space Poster - Halley's Comet

Comet Halley and Milky Way, 1986. I remember my Grandad saying, more than once, that he hoped he'd be able to see this--unfortunately, though, he passed away in December of 1983. Here's for you, Grandad!

from NASA

View of the Transantarctic Mountains

This image of the Transantarctic Mountains was taken from the NASA P-3 airborne laboratory on Nov. 27