Ok, photoshop practice :P
Basically, at school 2day, we took Galileo's observations of Jupiter's 4 closest moons (Io, Europa, Ganymede and Callisto) and put them numerically into Microsoft Excel, graphed the points, curve fitted them, and went home happy.
So I just took the graphs, tweaked the colours, and photoshopped them until something looked kinda cool xP
Ok, I know that
a) This is nerdy xP But what else was I gonna photoshop? o.O
b) It sucks, 'cause this is my 2nd ever photoshop image ^^;

P.S. It's a wallpaper =D