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Rhea window: NASA probe eyes Saturn's bright moon

NASA's Cassini Saturn probe has taken a glorious, full-frontal image of ice moon Rhea.

NASA/JPL-Caltech/Space Science Institute

Cassini's days may be numbered, but there's life left in the ol' satellite yet. As it continues its revolutions around Saturn, it's taken a stunning shot of Rhea, which at around 1,525 kilometres (948 miles) is the second-largest of Saturn's 62 moons.

In photographs, Rhea appears very bright when in direct sunlight. This is because the moon is roughly 75 percent water ice, which is highly reflective. In this image, Rhea is seen from the side that faces away from Saturn, and is therefore more pocked with craters. Rhea is one of the most crater-heavy of Saturn's moons, and subtle variations in the light across the surface hints at geologic activity in the past.