> There is probably plenty of scope to optimize space radiators. It was never a priority until now and is "just" an engineering problem.

Well, it's a physics problem. The engineering solution is possibly not cost efficient. I'd put a lot of money that it isn't.

That bit reminded me of someone who wanted us to design a patch the size of a small postage stamp, at most 0.2mm thick, so you could stick on products. It was to deliver power for two years of operation, run an LTE modem, a GNSS receiver, an MCU, temperature and humidity sensor and would cost $0.10. And it would send back telemetry twice per day.