Why is Mars Red? New Study Offers Surprises

Is Mars red due to rocks being rusted by the water that once flooded the red planet? And is the only explanation for the hematite found by Mars orbiters and studied by the Mars Exploration rovers is that water once was present in volumes on Mars? Not necessarily, says a new study. Research done by Dr. Jonathan Merrison at the Aarhus Mars Simulation Laboratory in Denmark shows that the red dust that covers Mars may be formed by ongoing grinding of surface rocks. Liquid water need not have played any significant role in the red dust formation process.
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