Astronomers will be able to analyze the chemical composition of the gases and dust from an erupting volcano on the surface of Jupiter's moon, Io.
"In fact,
the sulfur monoxide and dioxide in the
volcanic emissions would be easily
bright enough to image with the
millimeter array. Astronomers will be able to watch
the whole eruption, and the plume as it
dissipates into the Ionian night. The
Atacama Large Millimeter Array could make weather maps
for Io in short order."