I think humans are more likely to bring about the end of civilisation as we knew it than any cosmic force.Theres enough nukes in the world to really ensure we all have a bad day.
If the Mayans were so clever and adept at predictions and forecasts ...er..how come they didnt forsee their own demise i wonder ? No wee stone tablets with that little nugget is there...nup.
There have been so many "end of the world" dates come and gone , this will no doubt be another to add to the list and another bit of "evidence" or opportunity for someone to "find" proof of the matter arises.
Consider the space shuttle , now consider China or the Soviets or anyone else having similar , now arm those , theres your end of the world.
You got your doin's the day ...brilliant , im waiting on the mailman today too..its due , the dude said he mailed my pipe monday and its the same city so i should see it today...woo hooo..its brightening up a bit so ill see whats happening in the garden , 24 hours rain yesterday.