A Day on Io - 4/6 - Illustration - A Day on Io - 4/6...

A Day on Io - 4/6 - Illustration - A Day on Io - 4/6 - Artwork: Io always points the same face towards Jupiter during his orbit and like the Moon from Earth, Jupiter presents different phases to him. This series of images shows the landscape changing in a day from a point in the northern hemisphere of Io-4. At mid-day Io, the Sun is behind and the shadow of the satellite is projected on Jupiter - Io keeps the same face towards Jupiter as it orbits the planet. For this reason, Jupiter appears to hang motionless in Io's sky. Just as the Earth's Moon does, Jupiter goes through phases as Io orbits it. Here's a gallery showing the view from a location in the northern hemisphere during the course of a single day - 4. Halfway through the day, the sun is now behind us. We can see the tiny shadow of Io on the cloudtops of Jupiter