posted on Mar, 11 2008 @ 03:48 PM
I'm with the others who say it's lens flare. You can see the sky directly above is a bit brighter as if the sun or something is in that direction,
but out of frame...I don't think it is a coincidence that the sky is brighter directly above the location of the object in question.
I have my own screen cpature of that "glare" or "flare" or whatever...this photo is captured right before the OP's (they were in the process of
swinging the robotic arm out of the payload bay).
In my photo, the arm's joint is right at the "flare", and you can just barely make out that light tan color on the whit portion of the robotic arm
joint, meaning the object is NOT behind the joint -- although I admit this is very hard to see in this capture...it looked better on my computer.