Then, if we click on "A community-specific reason" we get this window:
This kind of implies that it might be an acceptable to close a question if it isn't best suited to Astronomy Stack Exchange. But uhoh has made this strong argument in the comments here:
@ConnorGarcia we should only close questions when they are off-topic where they are asked, not for "I think it's better asked elsewhere" by itself. Some questions are on-topic in multiple sites and some are off-topic everywhere. There isn't always a 1:1 correspondence between questions and their sites. The OP decides where to ask. We can make suggestions, and we vote to close if we are pretty sure the question is off-topic locally.
Is the wording in the "close vote" window misleading?