If you discuss the psychology of manned space flight, it's relevant. If you discuss the geology of Earth as a comparison with other planets, it's relevant. There will probably be more relevant geology discussions than psychology discussions, but it's the context that decides if they are appropriate in this forum or should be moved to Babbling. But almost every science can be related to astronomy and/or spaceflight, of course. It's the same with technology: if you discuss the lens of your telescope, do it here. If you discuss the lens of your digital camera, move it to Babbling. When in doubt, ask the BA.

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Knowledge is a curse, but ignorance is worse