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This video was assembled from a sequence of images taken by NASA's Perseverance rover with its Mastcam-Z camera on 2 April 2022. The object eclipsing (or, perhaps more accurately, transiting) the Sun's disk is Phobos, the larger of Mars' two potato moons.
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Phobos is 157 times smaller, and 64 times closer to its planet, than Earth's Moon. It's also below the size needed for its own gravity to pull it into a ball (what we call hydrostatic equilibrium). Read more: www.nasa.gov/solar-system... Video credit: NASA/JPL-Caltech/ASU/MSSS/SSI