The red color of Mars might have an earlier, wetter origin
https://www.theregister.com/2025/02/25/mars_red_ferrihydrate/
Scientists believe the red colour of Mars may trace back to a time when liquid water flowed freely across the planet’s surface. By combining data from ESA and NASA spacecraft, researchers have developed a new theory involving ferrihydrite, a mineral that could explain Mars’ unique hue. This discovery could reshape our understanding of the planet’s history and its potential for past life.