HashNode is a pretty good site for stuff related to programming in general. Articles on engineering tend to have a much more formal tone than ones here. HashNode is more of a small community of software devs than a formal wiki or Q/A forum like StackExchange.

If you ask a really hard science question here, you have to be really lucky to get an answer. You are free to write scientific articles here related already indirectly to computer science. I think they should get a decent reading.

Bottom line: Everything is allowed, no one will stop you. It might not be appreciated though.

P.S. I love engineering and science, but this is a community, and I'm trying to talk from its perspective.

Although I appreciate science articles , the only reason I visit Hashnode is for the programming content. It is my opinion that sorting through additional science content would make the user experience diminished for me.

We could follow stackoverflow and start hashexchange, by creating space.hashexchange.com.

("Hashexchange" sounds either like a market for zero day exploits, or platform to sell eachother drugs, so maybe the name needs work...)

To be serious though:

• If you're talking about software projects by NASA, I feel it's obvious that it's a suitable topic here... It's software after all, right?
• If you just want to talk about quasars and the Hubble constant, I don't know if it's allowed, but I also don't see why you'd want to. You'd get much more intelligent responses by joining an astro forum where people actually know anything about that stuff.