It comes from NASA/JPL from Opportunity. It was a panorama shot. I noted there was at least one more object in the image that I found to be dramatic and spectacular. My first thought was that this was ejected from the solar panels opening up, or something from Opportunity or the airbags. It this isn't part of the spacecraft or airbags, It'll be one of the most stunning images to date. IMO.
What I found amazing is that I didn't find anything on the JPL site that referred to this object.
If anyone has the official statement on this, I would appreciate hearing about it.
And I asked the same thing two days ago when I first saw this. I didn't believe it until I went to NASA/JPL site and found it. If this doesn't turn out to be part of the space craft/airbags, I'll be happy. It's my opinion that it's no rock.