Did you know?
How we know the age of the Earth…
Did You Know?
Q. How do we know the age of the Earth?
A. Using the decay of natural radioactive isotopes, we can date meteorites and the majority give overlapping ages close to 4.56 billion years. The Earth’s surface is younger because it is continually being modified, but the oldest rocks are >4.0 billion years. We think the Earth is closer to 4.56 billion years old because we can detect the stable decay products of relatively short-lived isotopes that became extinct within the first few tens of millions of years after formation of the solar system.