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Could Pluto Once Again Be Considered a Planet? New Remarks From NASA's Administrator Highlight an Enduring Debate Among Scientists
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Could Pluto Once Again Be Considered a Planet? New Remarks From NASA's Administrator Highlight an Enduring Debate Among Scientists

Smithsonian · May 5, 2026, 3:56 PM

Two decades ago, the International Astronomical Union—which defines and names celestial bodies—redefined the criteria for being a planet, putting Pluto into the new category of dwarf planet

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