@Swpb: Hello! This is regarding the name change of this template. First of all, most of the articles in the navigation box do not even include the "in space" suffix, so the name doesn't fit. It also seems unprofessional and/or informal. Also, I've seen several navboxes like this one with names like what I've proposed: Template:United States topics, Template:Asia topics, Template:Africa topics, Template:Islam topics, to name a few. The "___ topics" format seems to be the norm for these navboxes. Please consider my proposal! —  Melofors  TC  03:22, 5 February 2020 (UTC)

Informal, but not unprofessional. The "...in space" visible title communicates well, and no further descriptor actually needed. Randy Kryn (talk) 03:52, 5 February 2020 (UTC)
This navbox serves a different role than {{Spaceflight}} (which I think is the "Space topics" navbox you have in mind) – the idea here is to capture the space-related aspects of topics that are not specific to space. We have articles about hygiene generally, and then there's hygiene in space. There's tourism generally, and then there's tourism in space. The article titles may not be phrased "X in space", but they easily could be, and the phrase neatly illustrates what ties this particular group of articles together. —swpbT • go beyond • bad idea 14:14, 5 February 2020 (UTC)