[[UPDATE: There's now a fifth alternative interpretation -- one not listed below. Alfred McEwen, a planetary geologist at the Lunar and Planetary Lab at the University of Arizona, postulates that, "It looks like a linear streak artifact produced by a cosmic ray," noting that "cosmic energy from the stars can interfere with a camera's image sensor, depositing electric charges in pixels. If it hits at the right angle, it can affect several pixels in a row, forming a bright streak." That sounds more coherent than a camera glitch, though maybe it's the same thing but just more comprehensible to me. I don't know anything about geology or astronomy. But it leaves me with three questions:
1. Why the streak at only this location in this image? Why aren't there accompanying streaks?
2. Why does it appear three dimensional? If you look at the video (or check it for yourself), at close range, using Google Earth's rotation wheel, the object looks three dimensional.
3. Does Dr. McEwen have comparable examples? It would be nice to see some known streaks for comparison.
I'm willing to move this explanation to the top of the heap, but I'd like these issues addressed. Hopefully more input will come over the next few days