Bruce Murray Space Image Library

Caloris Basin, Mercury, as seen by Mariner 10

Caloris Basin, Mercury, as seen by Mariner 10
Caloris Basin, Mercury, as seen by Mariner 10 The Caloris Basin is one of the largest basins in the solar system at approximately 1,300 kilometers (800 miles) in diameter. Only half of it was seen by Mariner 10 as it sped past Mercury in 1974. NASA / JPL / Mark Robinson

"We're changing the world. Are you in?"
- CEO Bill Nye

Sign up for email updates