A new Kuiper Belt Object was discovered that is almost as large as Pluto. A debate about what constitutes a proper planet ensued, with some arguing that Pluto should be demoted and others saying that Sedna, as the new object was named, should be designated the solar system's tenth planet. | Harper's Magazine

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A new Kuiper Belt Object was discovered that is almost as large as Pluto. A debate about what constitutes a proper planet ensued, with some arguing that Pluto should be demoted and others saying that Sedna, as the new object was named, should be designated the solar system’s tenth planet.

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A new Kuiper Belt Object was discovered that is almost as large as Pluto. A debate about what constitutes a proper planet ensued, with some arguing that Pluto should be demoted and others saying that Sedna, as the new object was named, should be designated the solar system’s tenth planet.

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