Quote:
Originally Posted by Jerry
1) Assume all of the non-gas giant planets and moons with low albedos have the same density. [Snip!]
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This is where your argument went wrong. Nothing after this statement matters.
Albedo is a measure of the ability of a surface to reflect light. It depends on the composition of the surface (cloudy atmosphere? liquid ocean? ice? dirt? soot?) and the condition of the surface (smooth? rough?). The Earth would exhibit the same albedo whether its core was made of osmium or creamy nougat.