This “UFO” on Mars cropped up again on Reddit’s r/Skydentify, even though it was first noticed back in 2014.
Raw Image: https://mars.nasa.gov/raw_images/182036/?site=msl
It’s captioned “This image was taken by Right Navigation Camera onboard NASA’s Mars rover Curiosity on Sol 688 (2014-07-14 02:06:13 UTC)”
It does not appear in previous or subsequent frames. However ... Read even more
