Mercury: shrinking planet is still getting smaller

By David Rothery, Professor of Planetary Geosciences, The Open University Milton Keynes, Oct 3 (The Conversation) Planetary scientists have long known that Mercury has been shrinking for billions of years. Despite being the closest planet to the Sun, its interior has been cooling down as internal heat leaks away. This means that the rock (and, within that, the metal) of which it is composed must have contracted slightly in volume.

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