"An Inter-Planetary Shuttle?" —Mars’ Meteorites Cloak a Chemical Signature Almost as Old as the Solar System
The surface of Mars is pocked by more than 635,000 impact craters at least 0.6 miles (1 kilometer) wide. Each of the red dots shown on the image below represents one of the impact craters. A little-known fact is that each year Earth is hit by by half a dozen or so one-pound or larger rocks that were blasted off the surface of Mars by large impacts and found their way into Earth-crossing orbits. Nearly 10% of the Red Planet meteorites end up crashing into Earth.