25. Are there rocks on the Moon from other planets? (A K2S Question)

From The Space Library

Sometimes an impact is big enough to blow pieces of the impactor, as well as the object impacted, back out into space. These pieces will continue to orbit the Sun, and, depending on a lot of things in orbital mechanics, may end up in the path of another large object like the Moon. We've found rocks from the Moon and Mars on Earth, usually in Antarctica or the Sahara desert, so there are almost certainly rocks from Mars and the Earth on our Moon. The question is where they're hidden. Rocks from Venus and Mercury are also possible, though less likely.

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Answer provided by Thomas Matula, Ph.D. & Kenneth J. Murphy

Question and Answer extracted from the book Kids to Space - by Lonnie Schorer

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