If you look closely at the sky tonight and tomorrow (Tuesday and Wednesday) night, you might spot a real rarity: a comet that is close enough to be visible to the naked eye. According to National Geographic News, the cosmic body has brightened a million-fold since its discovery in June 2011, and will briefly be visible to sky-gazers in the Northern Hemisphere this week. It is now as close to our sun as it will get, about 100 million miles away. If you want to see it, look to the upper left of the moon about a half hour after sunset tonight. Tomorrow night, it will appear to the lower right of the moon. You're looking for a hazy smudge of light, possibly with a tail.

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