But there's still good progress being made. Here's a short article from the current issue of Physics Today. Oh man, trim a control surface and suddenly you get air dissociating into a super-heated high-pressure layer of atomic oxygen. Honestly, garden variety spaceflight is much easier. But again, we're making good progress. At least, we're no longer melting scramjets off of manned rocket planes. Go read the article to see how things are developing.
This was 50 years ago. 50 years before that, WWI biplanes were state of the art.
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