Think back to elementary school science. What makes Mars look red?
Answer Iron oxide in the surface material
Iron oxide is the reason for the reddish appearance of Mars, and it's also the reason for the color of blood and rust. Scientists think that Mars might have looked grey or charcoal in the past, before the iron oxidized!
Asked by Tori Highley · Last updated 5 years ago · 1.7K views · SOURCE
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