I wonder. If the world were going to come to a catastrophic/almost instant end, I would think the only place that could come from is outer space. Since there doesn't seem to be any Armageddon type comets hurtling towards earth right now, Dec. 21 doesn't seem too likely.
I don't put any stock in the Mayan prophecy of doom but it is fun to think about.
Oh yeah, if Aliens helped the Mayans, Egyptians etc. build their temples and pyramids, why did they build them out of rocks instead of metal and not give them electricity and stuff? I don't expect aliens arrived in spaceships made of rocks, mud and lit by candles.
In Omnia Paratus