[Rudder]

Thanks.

I guess we're back to the original, revised, sentence:

'No other celestial bodies support such a complex interplay of astronomical, geologic, and chemical and, in the sole case of Earth, biological processes.'

[SunkenCiv]

Right. My take on it was, not that each category applied equally to all planets, but rather that planets are more interesting in each category than are stars. Perhaps not more interesting than debris (asteroids, comets) though. :’)