I've been getting most of my updates for this from /r/space personally, but I think that's the main attraction of HN for me. I don't need to curate my own list of subreddits to get links to content that interests me, because it's all (mostly) likeminded people on here that are on average interested by the same kind of stuff as me. I find more new interests on here than I ever could on reddit looking through my preconceived list of interests.