Adrastea seems to be much like Metis, small and irregularly shaped. Adrastea was named after the daughter of Jupiter and Ananke. Metis was a justice and judgment figure, granting rewards and assigning punishments. Like Metis, Adrastea was first photographed by Voyager in the 1970s, but the moon appeared as nothing more than a point of light until Galileo arrived in the 1990s. Adrastea was discovered from Voyager mission data by David Jewitt while still a graduate student. Both Metis and Adrastea orbit synchronously and with Jupiter's Roche limit (see the sidebar "Why Are There Rings?" on page 128).They may be too small to be torn apart by tidal stresses, but their orbits will eventually decay to the point that they will fall into Jupiter.

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