STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY STEPHEN & DONNA O'MEARA / SCIENCE PHOTO LIBRARY
Comet McNaught, (C/2006 P1), the brightest comet since 1965, achieved a magnitude of -6 in January 2007 and was visible in broad daylight. This view shows the comet shining in the daytime sky near its closest passage to the Sun.
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