25 Nov 2013, 12:00 UTC
You don't have the right version of the adobe flash player to see this video. Please upgrade or install it at "http://get.adobe.com/flashplayer/"Subscribe to iTunes
Right this moment, a massive ball of ice and dust is careening toward the sun. Comet ISON has flared so bright in recent days that it’s now visible with the naked eye. And the comet will...
-- Read more on ScientificAmerican.com