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Planetary Science

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Reddish globe of Mars photographed against a dark background
EDITOR’S PICK

Why Is Mars Red?

Mars looks red because iron-bearing minerals in its rocks and dust became oxidized. Ferric iron compounds absorb more blue and green light and reflect more red and orange wavelengths. Fine dust spreads globally, coats…

Oct 1, 2026 • 12 min readRead the discovery →
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