in general, I only mees with Dffuse and Ambient for planets, because they are a special case.

Planets, in RL, don't get much ambient light, that's why you get a "terminator line" and night time! ;)
It's either the SUn, or almost nothing, this is why say, pcitures of lunar landings look so odd and folk think they have been faked :D

SInce space has no atmosphere, light isn't scattered (except by nebulae, gravitational lensing and other weird stuff that's not an issue for most renders!), so you don't get much ambinetlight except starlight, or a very close planet, nebula etc.

:)

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