Geologic study of moon rocks returned to earth by the Apollo missions.
Demonstrated relative densities of the 4 terrestrial planets and the moon.
Mercury’s average density of 5440 kg/m3) is much higher than the Moon's 3340 kg/m3) and is more similar
to that of Earth at 5520 kg/m3).
However, adjusting these average densities for the pressures due to overburden pressure, we get even more contrast.
Planet
Mercury
Measured Density 5440
“Uncompressed” Density (kg/m3) 5300
Venus
M 5300
U 4400
Earth
M 5520
U 4500
Moon
M 3340
U 3300
Mars
M 3940
U 3800
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