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. Last Updated: 07/27/2016

Moon's Age Estimated

DETROIT -- The moon's age is finally getting pinned down.

Of course, age is relative in a universe billions of years old. A new study narrows the moon's age down to a 20-million-year range.

Using a new tool to study lunar rocks, University of Michigan scientists have narrowed the time of the moon's formation to between 4.52 billion and 4.50 billion years ago.

Scientists believe the planets in our solar system began forming about 4.57 billion years ago.