Jupiter s Brain . ... Credit Copyright: Cassini Imaging Team , Cassini Project , NASA Explanation: Gas giant Jupiter is the solar system's largest world with about 320 times the mass of planet Earth . Famous for its Great Red Spot , Jupiter is also known for its regular, equatorial cloud bands, visible in very modest sized telescopes. The dark belts and light-colored zones of Jupiter's cloud bands are organized by planet girdling winds which reach speeds of up to 300 miles per hour. ...