It looks like I may be the culprit here, I only see three hst questions and they're all mine.
This is a simple enough request, so I've gone ahead and performed the merge; I can't think of a reason not to. In the process, I also created a synonym mapping hst to hubble-telescope. If we see something like hubble-space-telescope arise, I can merge that, if need be. But for now it looks like we're all good.