The universe is full of millions of tons of debris of all shapes and sizes. Out in space these are meteoroids. The moment it hits our atmosphere, it becomes a meteor. And if it actually makes it through the atmosphere and hits pay dirt, we call it a meteorite. Literal tons of this stuff hits the ground every day, but often it’s so small we never notice. On the other hand, every so often a big one makes it through, and some of them have been pretty amazing.