What topics should be revised, studied, or well understood, prior to the course?
Have you been able to apply what you learnt? To what sort of project or system/subsystem have you applied, or will apply, your course knowledge?
If you had to pay for this course yourself for professional development (and hopefully it's tax-deductible in your jurisdiction), would you attend?
I think the last two of the three questions in bullets takes the question from "kinda off-topic, but also open to interpretation" to "Hey! this is really off-topic!".
It seems all right, in my opinion, as long as they stick to asking about specific aspects (such as topics explored, prerequisites etc.) of space exploration-themed courses, but asking "would you invest?" or "have you applied this knowledge?" are almost an absolute no-no for SE.