Size of Planet Earth
About the size of planet Earth and how it has changed over the years, the density and elements in the core.
SIZE OF EARTH
In that earliest time, the proto-earth was 500 times heavier and 1,000 times larger than is the planet we now live upon. The heavier elements began to sink inward, while lighter elements--atmospheric hydrogen and other such--escaped into space. To this day, the phenomenon of "earth-leak" is still taking place as helium and other light gases continue to escape at the poles through gaps in the magnetic field.
The heavier elements at earth's core have achieved a condition of superfluidity whereby the combination of iron with a supposed very small increment of nickel, and perhaps cobalt also, makes for a different kind of solidity and density beyond our earth-surface standards. Earth is the heaviest planet, with an average density that's 5.5 times that of water. One terrestrial specialist once guessed that the heavy core must be made of supersolid gold, and thus the earth had "a heart of gold," but no scientist since has upheld this charmingly sentimental hypothesis.
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