This is an picture of the Lunar Prospector spacecraft, which was used to determine the size of the Moon's core.
Click on image for full size
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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