Credit: J. Spencer (Lowell Observatory) and NASA/ESA

In this picture of Io, the mound rising from Io's surface is actually an eruption from Pillan, a volcano that had previously been dormant. Measurements at two ultraviolet wavelengths indicate that the ejecta consist of sulfur dioxide 'snow, ' making the plume appear green in this false-color image. Astronomers increased the colour contrast and added false colours to the image to make the faint plume visible.

Provider: Hubble Space Telescope | ESA

Image Source: https://www.spacetelescope.org/images/opo9913e/

Curator: ESA/Hubble, Garching bei München, Germany

Image Use Policy: Creative Commons Attribution 4.0 International License