National Aeronautics and Space Administration
Book

Although we prefer to be involved from the beginning,
we can step in at any time and save the day.

A Meeting With the Universe

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Excerpt: A Meeting With the Universe
SSR: Final Reader

The Lord of the Rings. In this montage of individual Voyager 1 pictures, Saturn is surrounded by the newly revealed faces of six of its moons. Below Saturn at the right is Tethys, a heavily cratered moon with a long mysterious trench running along its surface.

To the left of Tethys, just below Saturn's rings, is Mimas, a tiny, pockmarked moon on which one huge crater can be seen. Enceladus is just below the left-hand edge of Saturn's rings; this moon displays a puzzling surface, smooth and apparently uncratered.

In the lower left corner is Dione, a brownish moon with a heavily cratered surface. Rhea, at the far left near Saturn's rings, shows a faint bluish tinge and strange patterns of white, wispy swirls on its surface. Titan, Saturn's largest moon, is shown in its distant orbit at the upper left. Titan's thick orange-brown atmosphere completely conceals its surface.