Open Issues by
nineplanets.org:
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•Mercury's density (5.43 gm/cm3) is nearly as high as Earth's. Yet in most other respects it more closely resembles the Moon. Did it lose its light rocks in some early catastrophic impact?
•No trace of iron has been seen in spectroscopic studies of Mercury's surface. Given its presumably large iron core this is very odd. Is Mercury much more completely differentiated than the other terrestrial planets?
Our explanation:
The origin of Mercury is like that of the rest of the planets of the solar system: all of them were one sun, which cooled down, then exploded to form the Earth and its sister planets: Mercury, Venus, Mars, ...etc.
Therefore, its constituents are almost the same with some differences here and there, like the differences between the Earth regions concerning the minerals distribution.
So all the planets have iron, silicon, copper, sodium, Potassium, and water ...etc.
But when Mercury lost its internal heat and became a cold planet (not the surface temperature, but the heat included in its core); so when it became colder, it shrank or contracted, and became denser.
In addition to that, its lava included in its core, which is a mixture of molten metals and rocks, then when it became colder, it became denser.
Another point is that Mercury gravity became weaker following its cessation from axial rotation, and as a result, it lost its atmsophere into the outer space.
So when astronomers estimated its mass and divided it by its volume without atmosphere, the specific gravity became more giving a denser picturre.
This is in contrast to Jupiter which has an enormous atmosphere, so they had the misconcept that Jupiter is gaseous, while in fact it is like the rest of the planets in origin and constituents; but because of its huge atmosphere, they had such misconception.
The indication that Mercury became colder than before lies in the fact that it contracted leading to the appearance of grooves, and fissures and trenches in large number on Mercury surface.
http://quran-ayat.com/universe/index...f_the_Planets_