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What observational evidence supports the idea that Mercury once shrank by some 20 kilometers in radius?

What observational evidence supports the idea that Mercury once shrank by some 20 kilometers in radius?<br/>

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Asked by Saii, Last updated: Jan 06, 2025

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saii

saii

saii
Saii

Answered Jun 07, 2019

The presence of many long, tall cliffs
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