Enhanced natural colour image of the surface of Jupiter's moon Io, taken by Voyager 1. The equator runs across the centre of the photo and the top & bottom are at lattitudes 75 deg N & S. The huge volcano, lower left of centre, is Pele, the black volcano to its lower left, Babbar Patera. The dark ring (upper left) is the lava lake Loki Patera. To the lower left of this is Ra Patera. The isolated volcano to the right, on the equator, is Prometh- eus. The reddish deposits on the left half of the photo consist of sulphur ejected by large volcanoes like Pele. The white deposits are sul- phur dioxide snow ejected from smaller volcanoes.