One of Mars’ most captivating features is its striking red color. Even to the naked eye, the vibrant hue of the Red Planet is clearly visible.
For centuries, humans have pondered the origins of this red coloration, possibly for thousands of years.
Initially, it was believed that the red shade stemmed from the presence of hematite (derived from the Greek word for “blood”), a dry iron oxide mineral also found on Earth.
Recent studies suggest that the continuous oxidation and weathering of Martian rocks during the water-poor conditions of the so-called “Amazon Age” (which began 3 billion years ago) could also contribute to Mars’ distinctive red appearance.
Much like hematite, the reddish color of rust arises from various oxides and hydroxides of iron.
However, a team of researchers has challenged the conventional understanding of hematite and proposed a new explanation.
These scientists utilized data from multiple space missions, including NASA’s Mars Reconnaissance Orbiter, the European Space Agency’s Mars Express, and ExoMars. They also integrated measurements collected from NASA’s Mars rover.
Recent research has identified another mineral known as ferrihydrite. This water-rich ferric oxyhydroxide is prevalent in Martian dust and likely exists in subsurface rock formations, potentially serving as the primary cause for Mars’ reddish color.
Laboratory tests of a synthetic Martian mineral mixture, composed of basalt and ferrihydrite, demonstrated a closer match to observational data than hematite.
For ferrihydrite to form on Mars, both oxygen and water must react with iron. While these components are scarce in Mars’ dry, cold conditions today, they may have been present in the planet’s ancient history.
On Earth, ferrihydrite quickly transforms into iron oxides, such as hematite. However, researchers have discovered that once formed on Mars, it can persist for an extended period.
This article responds to the question from Roy Bowman of Coventry: “Why is Mars red?”
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