Why is Mars Red?
For years, scientists believed that the Mars’ red hue was solely due to iron minerals rusting in dry conditions. However, new research indicates a wetter history for Mars. This research combines spacecraft data from the European Space Agency (ESA) and NASA with advanced laboratory experiments. The findings suggest that ferrihydrite, an iron oxide requiring water to form, is key to understanding Mars’ distinctive colour. Historical Context of Mars’ Colour Mars has long been known as the Red Planet. The previous consensus attributed its reddish appearance to hematite, which forms under dry conditions. This assumption was based on limited spacecraft data that did not detect water in Martian iron oxides. The new research challenges this view, suggesting that Mars had a more complex and wetter geological history. Key Findings of the Study The study reveals that ferrihydrite is a more accurate explanation for Mars’ red dust. Unlike hematite, ferrihydrite can form rapidly in cool, wet ...