The ‘jellyfish’ in NASA’s Mars rover image appears to have a single pixel 1-colour, solid black, double strike line across the artifact. Minor antialiasing and compression has very slightly blurred the lines.

My point being, whatever is in the photo is more likely what is under the double strike lines, rather than the lines being part of it. Furthermore, it appears to me this is not the first time a single pixel ‘strikeout’ line appears to have been drawn onto the raw image. I can only surmise this is either a cosmic ray artifact in the camera’s CCD itself, or, as I tend to believe instead, it is a markup artifact in the image accidentally uploaded as raw data for public view when it was in fact m...

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