Mars’s red dust may contain ferrihydrite, an iron mineral that forms in water. This suggests ancient Mars had water for ...

To keep the room from feeling “too blue,” Hunter echoed the ocher color from the wallcovering in the upholstered headboard and club chairs. That shade appears again downstairs in the powder ...

The ocean can be many colors, but for the most part it's deep blue. But why? And what's up with green or brown or red water?