Probably wouldn't have to be any bigger than your head to blow this whole fucking planet to smithereens if it was going that fast.

Oh and I doubt anything would happen at the galactic alignment. I think another theory is that earth will be bombarded with solar radiation that will knock out power grids, but to my knowledge that's already been discarded (since the two satellites orbiting the sun, somehow can tell that won't happen any time soon).

Also, end of calender =/= end of world. I don't know about you, but when December 31st comes around, nobody thinks that that's the end of the world because their OTHER calender lasted them two years! Yeah. It's alllllll bull, you're hearing a lot about it because its MONEY BABY.