JWST detected clay minerals on Neptune's inner moons - chemical evidence that Triton's arrival destroyed an entire ancient moon system 4 billion years ago.
Roughly four billion years ago, Neptune hosted a respectable collection of large moons orbiting in tidy, predictable paths — think Jupiter's system, orderly and stable. Then a Pluto-sized body barreled in from the Kuiper Belt and obliterated everythi... [2670 chars]