The Moon was formed when it collided with Earth billions of years ago.
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Articles on Age of Earth
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Starting at the surface, you would have to dig nearly 2,000 miles before reaching the Earth’s core. No one could survive that trip – and the 10,000-degree F heat once there would vaporize you anyway.
A biologist explains how researchers nail down the age of ancient fossils thanks to a physical process called radioactive decay.
