Scientists have finally figured out why Mars is red, which has been a mystery for a long time.
A study suggests that the mineral ferrihydrite is responsible for Mars' reddish dust, challenging the previous belief that hematite was the main cause of the planet's color.
Ferrihydrite forms in wet environments, suggesting that Mars was once much wetter than it is today.
The discovery raises questions about the possibility of past life on Mars and supports the idea of a different climate billions of years ago.