Amalthea is one of Jupiter's smaller moons. It was named after the nymph who nursed the infant Jupiter with goats milk. It is extremely irregular, having dimensions of about 270x165x150 kilometers in diameter. It is heavily scarred by craters, some of which are extremely large relative to the size of the moon. One crater (Pan) measures 100 kilometers across and another (Gaea) 80 kilometers across. The surface has a reddish color apparently caused by a dusting of sulfur originating from Io. Amalthea rotates synchronously with its long axis pointed towards Jupiter.