Webb telescope finds signs of ancient disaster for Neptune's moons

WASHINGTON, August 3 : New observations of some of Neptune's moons and rings are providing evidence of a catastrophe that occurred billions of years ago around the solar system's outermost planet in which a Pluto-sized interloper caused a celestial demolition derby.Researchers used NASA's James Webb Space Telescope to examine the composition of three of Neptune's small inner moons — Proteus, Larissa and Galatea — and its inner dusty rings, and detected clay minerals that one might expect to find deep inside certain worlds in the outer reaches of the solar system. These magnesium-rich minerals are known to exist on the dwarf planet Ceres, which orbits in the main asteroid belt between Mars and Jupiter, and in some meteorites. "These minerals require prolonged contact between liquid water an