[kingu]

Looks like a shadow to me as well... Besides, if you tossed a explorer vehicle at Earth, aiming for a desert space - what would be the chances of finding evidence of technology? Virtually zero?

[Orion78]

I don't think it is technology. If I had to guess, that would be my last choice, because as you said, what are the odds. I just found it intersting and very un-natural looking. Assuming it is a hole, and not just a shadow, I thought I would toss it out there in hopes a geologist freeper could lend some insight to what kind of natural processes could form such a evenly shaped hole.