Bruce Murray Space Image Library
Volcanic plumes on Io
![Volcanic plumes on Io](https://planetary.s3.amazonaws.com/web/assets/pictures/20130327_io_lor_20060226_plumesfade.gif)
A short-exposure image captures the surface features of the volcanically pock-marked moon, while a longer-exposure image reveals two plume fountains silhouetted against black space. Enhancing the contrast of the longer-exposure image brings out more detail in the plumes, which are from volcanoes named Tvashtar and Prometheus. Two bright conical shapes visible on the terminator (day/night boundary) are unnamed mountains.