The roundish red spot in Io's southern hemisphere contains a small yellow spot. These spots are almost certainly stars. By contrast, the eastern half of this image contains a number of green spots whose emission was thus detected by the green-yellow filter only. 180 to 225 gr. latit. The smallest features that can be discerned are 2.5 km in size.
North is to the top and the sun illuminates the surface from the left.
There are no landforms resembling impact craters, as the volcanism covers the surface with new deposits much more rapidly than the flux of comets and asteroids can create large impact craters. The temperatures are consistent with active silicate volcanism. The large lava flow in the upper left region of the image is more than 400 km long, similar to mare lavas on the Moon. Thumbnails on the left show only a fragment. Click on them to get original pictures.