Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
July 6, 1998
Explanation: What's cooking on Io? This active moon of Jupiter is marked with volcanoes spewing lava that is now known to be hotter than any lava on Earth. Above is the highest resolution colour-enhanced image yet composed of the most active surface in our Solar System. Features as small as three kilometres are visible. Sulfur compounds cause many of Io's unusual colours, while darker regions are probably composed of silicate rock.
Authors & editors:
NASA Technical Rep.: Jay Norris. Specific rights apply.
A service of: LHEA at NASA/ GSFC
&: Michigan Tech. U.