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Ok everyone - let's say there's a gigantic anti-gravity machine attached to the asteroid so that it actually does hit the earth at the speed of a truck backing up. What happens to the earth?
My first thought is, shit would get real fucked up before it even hit the ground. A rock that's thousands of miles in diameter sitting extremely near the earth for days as it very slowly approached the surface would cause serious gravity effects, like local tides would be completely fucked.
In terms of impact i think it would be pretty much just F=ma equation. According to a few rough estimate numbers i put into ai, it says the object would have 2.4x10^20 joules of kinetic energy. To put that in perspective, the nuclear bomb in Hiroshima released only 63x10^12 joules
What I'm hearing is that we should go to the Winchester, have a pint, and wait for this whole thing to blow over