It’s not frozen water like Earth’s snow, but a sulfur-rich material that looks like white snow, said Dr. Alfred McEwen, a planetary scientist at the University of Arizona, ... like snowflakes.

The 2022 Hunga submarine eruption in Tonga injected up to 3 billion tons of water vapor into the atmosphere, reaching altitudes above 57 km, and released about 20 million tons of sulfur, most of ...