Moon with an Iron Heart
A new study of the Moon suggests that our natural satellite has an iron core. This apparently makes it more Earth-like than would probably be the case had the Moon been simply captured by the Earth’s gravitational field. As a result, the finding adds weight to the theory according to which the Moon was formed when a Mars-sized object slammed into our planet, tearing off a chunk that became the moon. See National Geographic for more information.
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