APOD 4.2

Pictured above is how Jupiter's moon, Io, would appear to the human eye in true color. Its yellow color comes from sulfur and molten silicate rock, kept smooth and young due to its active volcanoes. The volcanoes erupt due to Jupiter's constant pull of tidal gravity, pulling and pushing the moon apart. It is said that the volcanoes are so active that the moon is basically being turned inside out, and it's lava is so hot that it glows in the dark.