Giant new dwarf planet discovered in our own solar system hiding in plain sight

This stellar new discovery needed some “space” before revealing itself. Scientists have long struggled to map the region of space beyond Pluto, relying on scattered discoveries and indirect clues from other planets’ movements.Now, researchers have announced a new discovery from the Vera C.Rubin Observatory, high atop Cerro Pachón in Chile.A large object in the Kuiper Belt — a distant region of icy and rocky bodies past Neptune — appears to be a new candidate dwarf planet.

Named 2026 ED138, its entire orbit lies within Pluto’s distance range from the Sun, yet it was only just discovered. The Rubin Observatory features the largest digital camera ever built for astronomy, capable of capturing a patch of sky equal to 40 full moons in a single shot.The telescope first saw light in June 2025, and by March 2026, the object entered its field of view.

Since then, the team traced it through 30 detections across 20 nights of Rubin observations, dating from 4 March to 11 July 2026.The light turned out to be one of the largest objects ever discovered past Neptune, potentially rivaling the size of other above-average dwarf planets, such as Makemake and Haumea.Astrophysicist Matthew Holman of the Harvard-Smithsonian Center spotted the object on Oct.13, 2026, while analyzing Rubin observations using software developed with colleague Kevin Napier.Searching older data, the team found the object in images from the Dark Energy Camera dating back to February 2016.

The camera had also captured it in 2017, 2018, 2019, and 2023.Holman noted that objects like this are “very rare.” Double-checking his work in “excited disbelief,” he made sure no errors had been made.The region beyond Neptune begins roughly 30 astronomical units (AU) from the Sun, and everything we know suggests far more remains hidden.

The Kuiper Belt extends out to 55 AU, beyond which lies the theoretical Oort Cloud.Thousands of objects past Neptune hint at materials in even more distant reaches....