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Question:
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 am 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.

A Smith


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