This image shows an icy cloud forming above Mars' surface. (NASA/JPL-Caltech/MSSS) At a Glance Plunging nighttime temperatures on Mars can trigger violent snowstorms.These storms could threaten the success of future missions to Mars.Researchers also discovered an upward release of water vapor into Mars' clouds may be behind the planet's disappearance of water. Mars is a frosty planet despite its fiery red-orange appearance, and plunging nighttime temperatures can cause weather much worse than researchers ever thought possible, according to a recent...