White Veins of Mars: Curiosity Hits 'A Jackpot' in Quest for Wetter Past

White veins of minerals coursing through rocks on the floor of Mars's Gale Crater are providing some of the strongest evidence yet that the rover Curiosity's landing site once was a wetter, warmer place. The details are still fuzzy. But the composition of the minerals indicate that they precipitated out of water flowing through fissures in the rock, while large grains within the rocks themselves are rounded, suggesting that water might have dulled their sharp edges. Yellowknife Bay, the rocky...Full Story