Can you shoot someone with a bullet... from orbit? asks about shooting a bullet from space to earth. This seems more like a physics question (how do trajectories work? how does gravity affect that?) than a worldbuilding question; I don't see where a world is being built here.
The question received some flags suggesting a migration to Physics, after which I left this comment:
Is this a worldbuilding question? It sounds more like a physics question to me.
That comment has ten upvotes, but the question had not a single close vote. It only takes 500 reputation to cast close votes.
A migration to Physics seems iffy to me; several of the answers would not be appropriate there. The OP would be better off asking a new question there, I suspect.
I've put the question on hold as off-topic while we discuss it. What should be done with this question?