Planet Mercury Has Shrunk More Than Thought

sciencehabit writes "Measuring just 4880 kilometers across, Mercury is a small world. The planet became slightly smaller as its interior cooled, which caused Mercury to shrink, buckling its surface and creating numerous cliffs and ridges. Now, after studying 5934 of these features, researchers report online today in Nature Geoscience that Mercury's contraction was much greater than previously thought: During the past 4 billion years, the planet's diameter decreased by 7 to 14 kilometers. The greater estimate of shrinkage accords with models that predict how much a rocky planet should contract as its interior cools; the new work may also lend insight into the evolution of extrasolar planets that, like Mercury and unlike Earth, lack any moving continents."

Comments

Someone left it in the dryer too long..

[toonces33]

Easy mistake to make.

Shrinkage sucks.

[Anonymous Coward]

It's the girth, not the length that matters.

Shrinkage

[Tippler]

The shrinkage of a body in response to cooling was experimentally derived by Dr. Costanza in the 90's.