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This is an picture of the Lunar Prospector spacecraft, which was used to determine the size of the Moon's core.
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Image courtesy of NASA

Earth's Moon--A Chip Off The Old Block?
News story originally written on March 19, 1999

Scientists used the Lunar Prospector spacecraft to find out that the Moon has a small core. The Moon's core is a lot smaller than the Earths' core. This helps scientists prove that the Moon formed from the Earth.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF