Lost sulfur in the universe may reside in salt on dust and pebbles

An international team led by astronomers at Leiden University has shown in laboratory experiments that sulfur can bind with ammonium under icy cosmic conditions and form a salt that sticks to dust and pebbles. The resulting sulfur salt not only helps to explain the mystery of the missing sulfur gas, but also a puzzling peak in data from the James Webb Space Telescope's MIRI instrument and other telescopes.