NASA's Ingenuity helicopter aces longest Mars flight in 18 months

That is its own shadow. Shortly before and after can be seen the bright spot around it. This is the Gegenshein, when sunlight is directly behind the observer and the sunlight pierces down to the bottom of irregularities on the ground. This is why the full Moon is so much brighter.
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Apr 18, 2020
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The shadow of Ingenuity appears throughout the video, complete with its rotating blades. The dark spot in question is bigger & lacks detail & only appears for a couple of frames.