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‘It’s big’: Astronomers make startling discovery of a possible dwarf planet beyond Pluto
Astronomers have spotted a new dwarf planet candidate in the solar system, beyond the orbit of Pluto, which they provisionally named ED138.
If future observations confirm the discovery, ED138 will join a group currently made up of five dwarf planets that have been recognized by the International Astronomical Union, or IAU: Ceres, Pluto, Haumea, Makemake and Eris.
The finding is the result of detections made by the Vera C. Rubin Observatory, a new telescope that sits atop a 2,682-meter-tall (8,800-foot-tall) mountain in Chile and houses the worldâs largest digital camera. The telescope started operating in 2025 and is capable of imaging the entire sky every three days.
Rubin Observatory reveals its first dwarf planet candidate in our solar system
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Scientists may add a new dwarf planet to the official roster of our solar system. The distant, icy body, provisionally dubbed 2026 ED138, orbits our system beyond Pluto. It was spotted earlier this month by a scientist combing through data from the Simonyi Survey Telescope at the NSF-DOE Vera C. Rubin Observatory.
Initial measurements place ED138 among the largest dwarf planet candidates ever discovered beyond Neptune; if confirmed, it would join the five dwarf planets recognized by the International Astronomical Union: Pluto, Ceres, Eris, Haumea and Makemake.
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