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Sleuthing the past
The birth of the universe, the galaxy, the solar system and earth
Early attempts
Clocks in rocks: how radiometric dating works
Earth's most ancient rocks
Moon rocks: samples for our nearest neighbor
Meteorites: ancient wanders of the solar system
Lead isotopes: hourglass of the solar system
The formation history of earth and meteorites: sorting out the details
The ages of the universe, the galaxy, and the elements
Summing up and looking ahead.

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