An article published in “Geophysical Research Letters” describes a study that attributes to a gigantic meteoric impact on Mars’ northern hemisphere almost 4.5 billion years ago some of the red planet’s features. According to Stephen Mojzsis of University of Colorado Boulder and Ramon Brasser of Tokyo Institute of Technology in Japan that’s the cause of the presence of rare metals, of the differences between the northern and southern hemisphere and perhaps even the existence of its two moons.