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Date: 1993 - 1999


Question:
Dear Newton,

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.

A Smith



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