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Nereid: Neptune's Moon May Be Last Survivor from Ancient Satellite System

KVIA•Wednesday, May 20, 2026 at 6:07 PM•CNN Newsource

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AI Summary

Recent research utilizing data from the James Webb Space Telescope suggests that Nereid, Neptune's third-largest moon, could be the only remaining intact moon from an ancient system that was likely destroyed by the gravitational influence of Triton, Neptune's largest moon. This new hypothesis challenges previous beliefs that Nereid was a captured object from the Kuiper Belt, revealing instead that its composition is more akin to regular satellites of Uranus. Nereid, which has a highly eccentric orbit and takes 360 Earth days to complete one revolution around Neptune, may provide insights into the early solar system and the dynamics of Neptune's moon system. The study, led by Matthew Belyakov, emphasizes the need for further research to understand Nereid's origins and characteristics.

Key Details: • Nereid is approximately 210 miles (338 kilometers) in diameter. • It takes 360 Earth days for Nereid to orbit Neptune. • The study was published in the journal Science Advances. • Further observations of Nereid's composition are needed for deeper understanding.

astronomy neptune nereid telescope solar-system

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NASACalifornia Institute of TechnologyKuiper BeltMatthew BelyakovNeptune

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