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I don't know how this would be done but I've often wished there was

space .ycombinator .com

(or spacetime .ycombinator .com)

Since there's no tagging, maybe a specially crafted search result

ie. (NASA, JAXA, IRSO, moon, satellite, space, telescope, hubble, voyager, supernova, etc.)

That would be pretty cool actually.

There is hn.algolia.com which can be used to (kind of, at least) achieve that but it's not a perfect fit.

This is a result if you search "JAXA" and sort by All for the Last Year so it's just kinda there