A colorful volcanic crater located on Io, the fifth moon of Jupiter. Images captured by the Galileo spacecraft in late 1999 and early 2000 show this geological formation clearly from space. Described at about 47 miles across and 300 feet tall, it is not nearly the tallest feature of the Io landscape. However, NASA indicates that the striking yellow, orange and black shown on images may be the result of large amounts of molten sulfur lava as it is heated and cooled. Other data gathered by the Galileo spacecraft indicate that the gravitational pressures exerted by Jupiter and its other satellites help to cause the volcanic eruptions and lava flows that can create this type of formation.