Saturn moon Dione, in the foreground of this image from NASA Cassini spacecraft, appears darker than the moon Tethys. Tethys appears brighter because it has a higher albedo than Dione, meaning Tethys reflects more sunlight.
Tethys and Darker Dione
Saturn moon Dione, in the foreground of this image from NASA Cassini spacecraft, appears darker than the moon Tethys. Tethys appears brighter because it has a higher albedo than Dione, meaning Tethys reflects more sunlight.