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Q&A: General Astronomy and Space Science
Q:
How old is the moon?
A:
The moon may be 4.5
billion years old, formed by a collision between the Earth and a very
large object. For a nice explanation of this, please see this NASA
website:
http://lunar.arc.nasa.gov/history/lhistory.htm
However, it's important to note that we actually do not know how and
when the moon formed! It is one of the mysteries of the Universe we
hope to figure out in the future.