That prediction was posted only in jest - as it would have surfaced sooner or laer anyway - unless you are a Nostradamus groupie however (in which case I apologize for hurting anyone's feelings if you take it seriously)
translation = later
LOL - Nostradamus has GROUPIES???!!!???
Never surrender your right to offend anyone. :)
I only came across the comet/impact thing when I was doing a historical search for the date.