There are, of course, reasons for this. First, Mars is much closer to the Asteroid Belt, the place where floating rocks generally congregate before deciding to head into the solar system. Secondly, Earth might have had a much larger number of such craters in the past, but an unstable crust, high erosion rates, active sources of lava, and even vegetation either destroyed most of them or concealed them from sight.
As it stands, Mars is sort of a time capsule, because, lacking all of the above, it was capable of preserving its craters pretty much in the same shape and form they had after the dust had settled in the wake of the strike.
There’s probably no better example of that than the image of the small crater we have here. Pictured by the HiRISE camera back in 2009, it resides in an undisclosed region of the planet, surrounded by a splash of material.
According to the scientists looking at these images, this is a relatively young crater (no estimate is given), “with dark rayed ejecta and a light-toned zone that extends beyond that ejecta.” They speculate “the bright ejecta consists of indurated fine materials, such as dust trapped by the roughened surface, then cemented over time.”
An impressive image to look at, and one that could help us better understand how the Martian soil behaves when hit.