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New Object Beyond Pluto Could Be a Dwarf Planet

The discovery was announced on October 27, but its classification is not confirmed.

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Science news editorial illustration for Rubin Observatory Finds Possible Dwarf Planet Beyond Pluto

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from the have a 2026 ED138. The is from the , the in an on 27.

The that it is 600 and 1,500 . That on its . are to its and it is a .

Source: Vera C. Rubin Observatory, 2026-10-27.

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Read and understand · 1/2Why is the size estimate a wide range?

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The estimated size depends on how much light its surface reflects. The text connects the estimated range to the amount of light reflected by its surface.

Clue: The team estimates that it is between 600 and 1,500 kilometres across. That wide range depends on how much light its surface reflects. Further observations are needed to determine its size and whether it is a dwarf planet.

Read and understand · 2/2How does the announcement describe 2026 ED138?

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A possible dwarf planet. The observatory describes 2026 ED138 as a possible dwarf planet.

Clue: Astronomers using data from the Rubin Observatory have identified a possible dwarf planet called 2026 ED138. The object is currently farther from the Sun than Pluto, the observatory said in an announcement on October 27.

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Explain what is known about 2026 ED138’s location and what scientists still need to check.

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It is currently farther from the Sun than Pluto. Scientists need more observations to determine its size and whether it is a dwarf planet.

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