How many years has there been a moon and an earth?
Replies:
The Earth has been around for between 4.5 and 4.6 billion years,
according to the most recent estimates I'm aware of. The moon is probably no
more than a few hundred million years younger than the earth. This is actually a
substantial fraction of the age of the whole universe (between 9 and 15 billion years) - so the
Earth is pretty old by just about any standard.
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