Each day we feature a different image or photograph of our fascinating universe, along with a brief explanation written by a professional astronomer. Jupiter , the solar system 's largest planet, is seen here next to Io , its closest Galilean moon. On the cloud tops of Jupiter near the left edge of the picture can be seen a dark circular spot which is caused by the shadow of Jupiter 's largest moon Ganymede . Jupiter 's cloud tops show light bands and dark belts.
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