The robot spacecraft Galileo in orbit around Jupiter has recently photographed the inner moons of Jupiter in greater detail than ever before. These pictures of Thebe , Amalthea , and Metis are shown to scale, and reveal details as small as three kilometers across. Amalthea , by contrast, has a total length of about 200 kilometers. Thebe appears dominated by a huge impact crater 40 kilometers across. Astronomers are uncertain of the origin of the unusual white gash at the bottom of Amalthea .
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