How old is Earth?

Scientists estimate that Earth—born out of a swirling cloud of gas and dust—is about 4.6 billion years old. They have reached this conclusion by studying Moon rocks and meteorites (rocks that have fallen from space to Earth) that they believe were formed at the same time as our planet.


This is a web preview of the "Handy Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App