With its iconic rusty hue, Mars has long been called the red planet. Now, scientists may have discovered the potential source of that distinctive coloring, overturning a popular theory in the process.

A new study led by Brown University researchers shows how a water-rich mineral could explain the planet’s color, hinting at a wetter, more habitable past on the Red Planet. PROVIDENCE, R.I. [Brown ...

One of the biggest reasons is the planet's reddish hue, earning the fourth rock from the sun one its most popular nicknames -- the "Red Planet." But what exactly gives the planet its iconic color?

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