On March 16, it was revealed on Nature Geoscience that Mercury, the...

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Apr 9, 2014 08:38
On March 16, it was revealed on Nature Geoscience that Mercury, the most inside planet in the solar system, has shrunk for the past four billion years more than it was expected.

Mercury's diameter is approximately 4,880 kilometers.
However, according to Paul Burn at the Carnegie Institution for Science, its diameter has contracted by approximately 14 kilometers because its inward has been cooled.
This is twice as much as it was estimated.
Unlike the Earth consisting of multiple plates, Mercury consists of a single hard crust, so there are some valleys due to contraction.
The research team has looked into more than 5,900 geography data and has calculated how long Mercury has shrunk.
In 1970s, a probe vehicle took photos of 45% of the Mercury surface and it was estimated that the Mercury contraction was from 2 to 4 kilometers diameters.
― A Japanese article ―

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