Comet ISON in an image taken on Nov. 19 by a telescope at the Marshall Space Flight Center in New Mexico. NASA hide caption toggle caption NASA The Two-Way If Comet ISON Survives The Sun, The View May Be Spectacular November 25, 2013 Once again, there's talk about a possible "comet of the century." Will ISON be a thriller or a dud? It's due to whiz by the sun on Thanksgiving Day. If it holds itself together after that, the comet could put on a stellar show in December.