Overview
- The peer-reviewed study, published December 18 in Science, identifies the earlier Fomalhaut b (now cs1) and a 2023 source (cs2) as collision debris rather than planets.
- Hubble imaging shows two transient, planet-like points in the star’s outer ring that faded or evolved over time, consistent with expanding dust clouds.
- Modeling suggests the parent bodies were about 60 kilometers across and implies a populous belt of roughly 300 million similar planetesimals.
- Seeing two such events in about 20 years far exceeds prior expectations of roughly one comparable collision every 100,000 years.
- Approved JWST follow-up and continued monitoring aim to track cs2’s evolution and probe dust properties, with teams also investigating whether an unseen planet could be stirring collisions.