Astronomy Picture of the Day

Ancient Craters on Saturn's Rhea

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#87577 by @ 31.05.2006 00:00 - nach oben -
Ancient Craters on Saturn's Rhea

Saturn's ragged moon Rhea has one of the oldest surfaces known.

Estimated as changing little in the past billion years,
Rhea shows
so old they no longer appear round – their
edges have become compromised by more recent cratering.

Like Earth's Moon,
Rhea's rotation is locked on Saturn, and the
>above image shows part of
Rhea's surface that always faces Saturn.

Rhea's leading surface is more highly cratered than its trailing surface.

>Rhea is composed mostly of water-ice but is thought to have a
small rocky core.

The >above image was taken by the
>robot Cassini spacecraft now orbiting Saturn.

Cassini swooped past Rhea two months ago and captured the
above image from about 100,000 kilometers away.

spans 1,500 kilometers making it Saturn's second largest moon after

surface features on Rhea
remain unexplained including large light patches.

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