Giving Thanks for a Comet, Live on Google+

On Thanksgiving Day -- Nov. 28, 2013 -- the showy comet C/2012 S1 (ISON) will scream past the surface of the Sun, skimming over the roiling surface of our star at a height of just 1.1 million kilometers (700,000 miles). We don't know if the comet will shine mightily, blast off chunks of itself, or disintegrate completely during this close encounter. But you can watch the whole thing live, with me, and a pile of NASA scientists on Google+! NASA is holding a live video Hangout on G+ during ISON's ...