Snow and ice will sweep through the midwestern United States into Wednesday ahead of the next blast of Arctic air poised to arrive late this week. The same storm that blanketed the interior West with a fresh round of snowfall to start the week is sweeping through the Central states. The storm produced blizzard conditions over the High Plains of …

A cross-section of a thick sheet of underground ice on Mars. The slope rises as high as London’s Big Ben tower. Beneath its ruddy layer of dirt is a sheet of ice 300 feet thick that gives the landscape a blue-black hue. If such a scene sounds otherworldly, it is. To visit it, you’ll have to travel to Mars. Planetary …