Curiosity Finds Tantalizing Mineral Clues for Mars Habitability

The mineral, hematite, is formed when another mineral, magnetite, is exposed to Mars' atmosphere and water.

November 5, 2014
6:12 PM EST
This side-by-side comparison shows the X-ray diffraction patterns of two different samples collected from rocks on Mars by NASA's Curiosity rover. | NASA/JPL-Caltech