One great image, chosen for the day. I try to guess what it is or what it's all about. People, places, flora and fauna. The colors are always incredible. Then there are 4 hidden boxes that provide a clue, a question, and a link. From there you could end-up at an article full of details about the selection. Or, you could find loads of other pictures related to, or of the same celestial body, in this case.
It's an internet adventure, and I always learn something new. And by the way Io is one of Jupiter's moons.
