One of Neptune's 16 moons is not like the others, James Webb telescope finds - and it could be key to fully understanding the solar system
Live Science • • general
Key Points:
- New research published in Science Advances challenges the long-held belief that Neptune's moon Nereid was captured from the Kuiper Belt, revealing instead a different origin based on its unique composition observed by the James Webb Space Telescope (JWST).
- JWST's data showed that Nereid contains significant water ice and has a spectral profile distinct from Kuiper Belt objects, allowing direct comparisons that contradict previous capture theories tied to its elliptical orbit.
- Simulations suggest that Triton, Neptune's largest moon, was captured from the Kuiper Belt and disrupted Neptune's original moons, possibly creating Nereid as a surviving remnant of that original satellite system.
- The study highlights gaps in understanding moon formation around ice giants like Uranus and Neptune, which is critical since such planets are common in exoplanetary systems, and both planets have lost their first-generation moons due to past collisions and captures.
- Researchers aim to obtain higher-resolution JWST observations of Nereid to further investigate its nature, hoping it serves as a rare intact example of original satellites around ice giants, offering insights into planetary moon formation.