The Composition of the Solid Surfaces of Planets and Satellites

The composition of the solid surfaces of planets and satellites (moons) that do not have substantial atmospheres can be found by:

A) measuring the thermal emission from the surface at several wavelengths in the microwave and infrared regions of the spectrum.
B) comparing the spectrum of the sunlight reflected from the surface with the spectrum of direct sunlight from the Sun.
C) comparing very broad absorption features in their spectra with spectra of known substances on Earth.
D) measuring the wavelengths of narrow absorption lines in their spectra.

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