Astrophotographer Adam Block captured this view of Comet ISON on the morning of Oct. 8 with the 0.8-meter Schulman Telescope at the University of Arizona SkyCenter atop Mount Lemmon.
Adam Block / CaelumObservatory.com
Month in Space: October 2013- slideshow - slide - 1 - NBCNews.com http://www.nbcnews.com/slideshow/technologyandscience/month-in-space-october-2013-53426718
Minimum credit line: Roger Lynds/NOAO/AURA/NSF
Comet Ikeya-Seki, photographed from Kitt Peak at dawn on October 29, 1965, courtesy of Roger Lynds. (4 minute exposure on High Speed Extachrome)
National Optical Astronomy Observatory: Comet Ikeya-Seki
Philipp Salzgeber
Comet - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Comet
彗星 - 維基百科，自由的百科全書 http://zh.wikipedia.org/wiki/%E5%BD%97%E6%98%9F
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