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A very good question, and one that is difficult to prove - However.
If we forget about gravitational compression, Mercury is the densest planet in the Solar System. Earth being the most dense at 5.515 g/cm3 whereas Mercury has a density of 5.427 g/cm3 -- So not a lot in it.
Current theories suggest that early in the formation of the Solar System, there were a lot more planets orbiting the Sun. Many crashed into other planets - Theia and the creation of the moonis one example, and I'm sure there were others.
Mercury had a sister planet of about the same size and mass, but also in the same orbit. Disaster was bound to happen - eventually.
When the two planets collided, almost head on, the core of the second planet merged with Mercury and blasted the lighter material into outer space, this was eventually consumed by the Sun or accreted onto other planets. Mercury, now had an incredibly dense core and a "sifting" of lighter materials on it's surface.
So Mercury has an incredibly large iron core compared to other planets, and this is why it has such a large density compared to other planets.
What else can I help you with?
What planet is denser than water?
Mercury is denser than water, with a density of about 5.43 grams per cubic centimeter compared to water's density of 1 gram per cubic centimeter. This makes Mercury one of the densest planets in our solar system.
How are the planets classifications as a terrestrial plaent or gas giant generally related to their densities?
Rocky planets are denser than gas giants.
Is there something that mercury has that no other planet has?
mercury is very very heater than other planets
Is mercury denser than alcohol?
Yes, mercury is denser than alcohol. The density of mercury is about 13.6 times greater than the density of alcohol.
How can you use denser in sentence?
Mercury is denser than oxygen.
Is mercury denser than honey?
Yes. Mercury has a greater density than does honey.
Is Jupiter hotter than other planets?
No, in fact many planets are hotter than it. the warmest is Venus and then Mercury.
Are there any other inner planets other than mars?
Earth, Venus, and Mercury are also inner planets.
What are the planets from largest to smallest?
Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars and Mercury Distances from the Sun are Mercury = 0.387 Astronomical Units from the Sun, Venus = 0.723, Earth=1, Mars=1.52, Jupiter = 5.20, Saturn =9.54, Uranus :] = 19.2, Neptune=30.1,
Is planet mars smaller than the other planets?
It is the second smallest of the 8 planets, only larger than Mercury.
Which is denser silver or mercury?
Mercury is denser than silver. Mercury has a density of about 13.6 g/cm³, while silver has a density of about 10.5 g/cm³.
Are outer planets denser than smaller planets?
No. The outer planets are gas planets, which are much less dense than the inner terrestrial planets.
