A new NASA-funded study revealed yesterday the iron mineral ferrihydrite is likely responsible for Mars' distinctive red color, suggesting the planet once had a cool, wet, and possibly habitable environment. Researchers in the study analyzed data from Mars missions and replicated Martian dust in a lab.
The findings challenge previous theories that Mars’ red hue was due to hematite, a dry iron oxide that forms in warm conditions. However, the study indicates ferrihydrite, which forms in cool water, is widespread in Martian dust and rock formations. The presence of ferrihydrite—commonly found on Earth in environments such as freshwater systems, hot springs, and volcanic settings—suggests water may have been present on Mars for a longer period than previously thought, potentially supporting the existence of life, and possibly even forming ancient beaches.
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