Do you know much about Mjölnir?
I saw an article about the astrophysicist Neil deGrasse Tyson estimating the weight of Mjölnir to be around 4 quadrillion lbs. Wouldn't something of that amount of mass screw with Earth's rotation or magnetic field? And in the movie, how could that weight be contained on that flying ship or any of the buildings Thor was on? (I know I'm picking apart a fictional component of a movie, but somebody has to, right?)