1) Density
- Pro: If we know volume and mass, we can make material guesstimates from density.
- Con: Not so good for things made of many materials (e.g. the golf ball).
2) Reflectance Spectroscopy
- Pro: If light is reflecting, we can look at which the spectrum to find what material it's made of.
- Con: It only tells us what's on the surface...
We need something else to help us probe the interior of mixed material planets...
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