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Mercury

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Mercury’s surprising density: What about magnets?

A new model explains Mercury’s major density with magnetism.

Forming Mercury and Iron-rich Exoplanets

Mercury’s high density has been a longstanding puzzle in planetary science. Its density means that it must have a significantly higher iron abundance than Venus, Earth, Mars, or the asteroids, probably in the form of a large iron core. NASA’s MESSENGER mission has challenged many of the hypothesized ways to create an iron-rich Mercury; a new hypothesis is required.

Did Mercury Spin Backward?

Today, Mercury rotates only three times in two Mercury years. How did the planet get to this state? Was Mercury tidally locked in the past?

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