Circle Artifact & More Imaged By NASA's Curiosity Rover, Sept 2014, UFO Sighting News.

Date of discovery: Sept 2014
Location of discovery: Mars
Photo: Sol 735
NASA source: http://mars.jpl.nasa.gov/msl-raw-images/msss/00735/mcam/0735ML0031520060205294E01_DXXX.jpg

Whatsupinthesky37 of youtube states:
SOL 735 is turning out to be some of the best images of Anomalies that we have from the rover. With this comes a lot of the "blinds" and "blurring" effects on these images but although they are blurry they can be made out! I have been getting emails and messages bout these for the last week. I will be doing a lot more from this day. Let me know what you think this circle thing is! Looks almost like a downed ship or equipment that moved along the ground. Your guess is as good as mine! I see what I see and you see what you see!