You can just barely see the artifact, which is circled in red.
It's not an "artifact," it's just a shape. It's always so silly when people freak out about some rock on Mars or somewhere happening to look like something familiar. There are
billions of rocks on Mars or the Moon, and they all have different shapes.
Of course some of them are going to accidentally resemble something that has meaning to the human eye.
A close-up of the artifact. It is said to be a derelict starship. It looks artificial to me.
It's a ridge of rock. It's clear enough between the two photos that the light has shifted, lengthening the shadows it casts.
Seeing airless, lifeless landscapes from high overhead is not something the human eye and brain have evolved to do. So our minds don't recognize what we're seeing and desperately scramble for something familiar to associate it with. So we imagine we see familiar shapes and structures.
It's called pareidolia -- the tendency of the human brain to imagine patterns where they don't exist. Our brains are evolved to construct meaningful patterns out of fragmentary information -- like, say, seeing an approaching predator through the leaves of a bush so we know we should run -- and that creates a tendency for false positives, imagining patterns in random information. That's why we can see animals in the clouds or mythological figures in the constellations or the face of the Virgin Mary in a water stain on a wall. We can even look at this --

-- just two dots and a curve in a yellow circle -- and perceive it as a human face, which is insane if you think about it. That's how good our brains are at superimposing meaning onto meaningless shapes. Which is why "That looks like X to me" is the worst possible reason to believe that something is X.
This, for example, on the other hand does look airbrushed:
Of course it doesn't look airbrushed. These images all need to be processed and enhanced to bring out the information they contain, which often creates data glitches. You can see the same kind of glitches show up in Photoshop if you enhance a digital image or alter its contrast or saturation. Also, these images are transmitted from millions of kilometers away, and sometimes a stray cosmic ray or a bit of interference scrambles a bit of the data.