Mars and the Earth run into debris in space regularly, and on our planet, meteors usually vaporize in the atmosphere.
On Mars however, with a surface pressure 1/100th that of the Earth, the impactors generally make it to the surface. This particular impact took place on Mars sometime in the last 5 years. Although the crater is small, the rays of ejecta thrown out by the impact are easy to spot, stretching out almost a kilometer.
The map is projected here at a scale of 25 centimeters (9.8 inches) per pixel. (The original image scale is 25.6 centimeters [10.1 inches] per pixel [with 1 x 1 binning]; objects on the order of 77 centimeters [30.3 inches] across are resolved.) North is up.
The University of Arizona, in Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., in Boulder, Colorado. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.