This is a picture of a part of Europa, a moon of Jupiter. Europa is covered with ice; the lines covering the surface are largely cracks in the ice, caused by meteorite impacts and flexing of the ice caused by internal activity.
Europa is particularly interesting because analysis of the images sent back by the Galileo space probe suggest that under the icy top layer there may be liquid water. Since as far as we know, liquid water is required for life to develop, this is an important fact, if true.
PtyS 106 is the course that talks the most about Europa.
PtyS 403, PtyS 407, and PtyS 411 also partly deal with Europa.
Some other places you can find information on Europa include: