"Barry Schwarz" napisal w wiadomosci
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On Sun, 9 Dec 2012 18:58:54 +0100, "Szczepan Bialek"
wrote:

The density of the Earth is 5.52

The Mars has 3.95 and The Moon 3.34

Is the density the diameter dependent?
S*

Density is simply mass divided by volume. The volume of a sphere is
directly related to the cube of the diameter. So in some sense, the
density is affected by the diameter.

For two objects with the same diameter, the one with more mass has the
greater density. Similarly, for two objects with the same mass, the
one with the smaller diameter has the greater density.

In the real world, the overall density of an object is determined by
the density of the matter it is made up of,

The Earth, Moon and Mars are simmilar and are close to each other.

The differences are rather big. So should be a lot of theories to explain
this phenomenon.
Are such theories?
S*