Excited for the August 21 eclipse? Visit our Eclipse 2017 page to explore the science, history, and myths of the event. The Curiosity team will be viewing the eclipse alongside NASA in Carbondale, Illinois. Follow us on Facebook for live videos, trivia, and interviews on the big day.
How Old Is That?
Watch And Learn: Our Favorite Content About Earth's History
How To Date A Planet
Share the knowledge!
Key Facts In This Video
Earth's outermost layer is constantly renewing itself, making the planet appear "younger." 00:21
The mineral zircon is durable, like quartz, but contains small traces of radioactive uranium. 01:31
Uranium-lead dating of zircon tells us that the Earth is at least 4.4 billion years old. 02:33