Why is Mars Red? (Fact of the Day)

In short, it is due to the high presence of iron oxide. The same iron oxide is the reason for rusting. The high amount of iron which is present on the surface of Mars reacts with the Sun's radiation. The solar wind breaks down water molecules and oxidizes them. One of the theories for the abundance of iron in the soil suggests that it is due to the volcanic eruption. The presence of water in the early years is believed to have started the process of oxidation.

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