Researchers have long-suspected ice to persist on Mercury, a hypothesis based on Earth-based radar studies of the small planet. But other substances beside water, such as sulphur, could have explained ...

Ice, ice, baby — too cold, too cold. A recent spacecraft flyby over Mercury has experts believing that the planet closest to the sun has “frozen water” on its surface — and they’re ...

Among the questions it will probe, according to ESA, is whether water ice really exists in the planet's craters and what Mercury's surface is actually made of. Stephanie Pappas is a contributing ...