This infographic uses a composite of Viking 1 orbiter images and an outline of the United States to show the scale of the Valles Marineris.
Image credit: NASA.

The largest canyon system in the solar system is Valles Marineris on Mars. It is more than 4,000 kilometers (3,000 miles) long — enough to stretch from California to New York. It is nine times as long and four times as deep as Earth’s Grand Canyon!

Find some more fun space facts by downloading NASA’s ‘mini space facts poster’ here!