"We suspect the temperatures are revealing differences in texture on the surface," said John Spencer, a Cassini composite infrared spectrometer team member based at Southwest Research Institute in Boulder, Colo. "It's maybe something like the difference between old, dense snow and freshly fallen powder."
Even if surface texture variations are to blame, scientists are still trying to figure out why there are such sharp boundaries between the regions, Spencer said. It is possible that the impact that created Herschel Crater melted surface ice and spread water across the moon. That liquid may have flash-frozen into a hard surface.
I'm gonna go ahead and go out on a limb and say Space Invaders had something to do with this. No? Okay how about Donkey Kong? I'M NOT GRASPING FOR STRAWS YOU'RE GRASPING FOR STRAWS. Or is that your peener? *swish*
Thanks to drew, Joe = Best Pag, Alex, Liam, Nam Som, Tim, Nick, Tony, Culley, john, PeteN, Curtis, Andy, Colin, Peter, The boy with the big face, Richie Rich, Guillaume and Gregatron, who are all convinced the Mooninites put Pac up to it.