Comet McNaught may be visible in Southern California for the rest of the week (it is now brightest in the Southern Hemisphere but has hung around Northern skies longer than expected). It's the brightest comet in our sky in 42 years, and can be seen chasing the sun at sunset with the naked eye. In recent days, McNaught has also been photographed in daylight. Discovered last August by an Australian astronomer, the comet is not named after Miss Australia 2006 Erin McNaught. More amazing photos at flickr and spaceweather.

photo via treedork's flickr, taken January 11 in Seattle.