{"data":{"id":1695,"lang":"en","title":"Webb Telescope Confirms Neptune Moon Nereid as Last Original Survivor of Triton Capture 4 Billion Years Ago","summary":"Caltech-led JWST study published in Science Advances finds Nereid's ice-rich, bluish composition marks it as an original Neptunian moon that survived Triton's violent capture 4 billion years ago.","category":"science","category_label":"Science","published_at":"2026-05-22T22:01:09Z","updated_at":"2026-05-22T22:01:09Z","url":"https://techtools.cz/tools/news/article/1695-webb-telescope-confirms-neptune-moon-nereid-as-last-original-survivor-of-triton","api_url":"https://techtools.cz/news-api/v1/articles/1695?lang=en","markdown_url":"https://techtools.cz/news-api/v1/articles/1695.md?lang=en","image_url":"https://cdn.mos.cms.futurecdn.net/Yi5ppPdA67jjPtX2AFeENb.jpg","word_count":223,"reading_time_minutes":2,"sources":[{"url":"https://www.space.com/astronomy/neptune/where-did-neptunes-mysterious-moon-nereid-come-from-it-may-be-the-only-survivor-of-the-planets-violent-history","domain":"space.com"},{"url":"https://phys.org/news/2026-05-neptune-mysterious-moon-nereid-survivor.html","domain":"phys.org"},{"url":"https://www.cnn.com/2026/05/20/science/neptune-moon-nereid-survivor","domain":"cnn.com"}],"translation":{"lang":"cs","id":1768,"title":"Webbův teleskop potvrdil, že Neptunův měsíc Nereida je posledním původním přeživším zachycení Tritonu před 4 miliardami let","url":"https://techtools.cz/tools/news/clanek/1768-webbuv-teleskop-potvrdil-ze-neptunuv-mesic-nereida-je-poslednim-puvodnim","api_url":"https://techtools.cz/news-api/v1/articles/1768?lang=cs"},"content":"A Caltech-led team using NASA's James Webb Space Telescope has determined that Neptune's mysterious moon Nereid is the last surviving original satellite of the planet, not a captured Kuiper Belt object as long suspected. The study, led by Matthew Belyakov and published in Science Advances on May 20, 2026, shows Nereid is richer in water ice, brighter, and bluer than typical Kuiper Belt bodies, with none of the volatile organics seen on those distant objects.\n\nNereid, discovered by Gerard Kuiper in 1949, follows a wildly eccentric orbit that has puzzled astronomers for decades. The new findings suggest its strange path is a relic of cosmic violence: when the giant moon Triton was captured by Neptune more than 4 billion years ago after wandering in from the outer solar system, it scattered Neptune's original moons onto destructive collision courses. Nereid alone escaped intact, flung into the elongated orbit it still traces today.\n\nThe team needed only about 10 minutes of JWST observation time to gather enough compositional data to rule out a Kuiper Belt origin, and complementary dynamical simulations reproduced how Triton's arrival would have stretched Nereid's orbit. The result reframes Nereid as a fossil witness to one of the solar system's most chaotic ancient episodes and bolsters the case that Triton itself is a former Kuiper Belt dwarf planet now bound to Neptune."}}