[dogscoff]

How do you tell what facilities a planet has? Will a scanner do? I haven't tried, sorry.

Nope.

So far the only way I can think of is going into combat, checking out the facs, then deciding. But obviously that's going to be useless for strategeic.

You can find out from intel, and you can often spot the resupply depot by watching enemy ship movements. ditto for spaceyards, actually. Human players will generally put their spaceport on the first planet they colonise in any given system, which is usually that huge, breathable one over there with the high mineral value and the most population on it- unless there used to be ruins in the system, of course. Not sure how AIs make their choices.

Best just to capture everything and sort it out after=-)