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Is Mars red because of iron corrosion? If so, what process caused it to occur? | Astronomy.com

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Is Mars red because of iron corrosion? If so, what process caused it to occur?

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FROM THE September 2013 ISSUE

Is Mars red because of iron corrosion? If so, what process caused it to occur?

Ron Chinchen, Berala, New South Wales, Australia

Published: Monday, July 22, 2013

RELATED TOPICS: MARS

Mars red surface

“Corrosion” is a general term for the breakdown of bonds among molecules in a material — like the way battery acid can corrode the metal inside a flashlight. A more specific chemical alteration term — and one used to describe what’s happened on Mars — is “oxidation.” Oxidation occurs when atoms and molecules give up their electrons in the presence of free oxygen molecules (O₂), which are strong electron acceptors.

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