A propeller-shaped structure created by an unseen moon appears dark in this image obtained by NASA Cassini spacecraft of the unilluminated side of Saturn rings. The propeller is marked with a red arrow in the top left.
Propeller from Unlit Side
A propeller-shaped structure created by an unseen moon appears dark in this image obtained by NASA Cassini spacecraft of the unilluminated side of Saturn rings. The propeller is marked with a red arrow in the top left.