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Shrinking Mercury is tectonically active

28 September 2016 Astronomy Now

Images from NASA’s MESSENGER spacecraft reveal previously undetected cliff-like landforms on Mercury that scientists believe must be geologically young, which means that the innermost planet is still contracting and that Earth is not the only tectonically active planet in our solar system, as previously thought.

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Most volcanic activity on Mercury stopped about 3.5 billion years ago

7 August 2016 Astronomy Now

New research from North Carolina State University finds that major volcanic activity on the innermost planet most likely ended about 3.5 billion years ago — in stark contrast to the volcanic ages found for Venus, Mars and Earth. These findings add insight into the geological evolution of Mercury and what happens when rocky planets cool and contract.