Olympus Mons colour-coded according to height from white (highest) to blue (lowest).
Image credits: ESA/DLR/FU Berlin (G. Neukum).
Five years of Mars Express gravity mapping data are providing unique insights into what lies beneath the Red Planet’s largest volcanoes. The results show that the lava grew denser over time and that the thickness of the planet's rigid outer layers varies across the Tharsis region.(read more)