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Tethys and Darker Dione

土星壁纸

by NASA/JPL/Space Science Institute

NASA Image Library · 公有领域（Public Domain）

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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.

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