A 1.5-kilometer ice-cream sandwich. According to the University of Washington, whose release Astrobiology.com reproduced, the north pole of Mars is built as a deposit 1.5 kilometers thick: slabs of almost pure ice, 0.05 to 0.5 percent dust, alternating with beds where dust makes up 25 to 75 percent. The portrait comes from a study by Pari Mohan and Aditya Khuller, published in npj Space Exploration. Continuer de lire Mars’s Polar Ice Is Cleaner Than Estimated