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Definition of planet

Sedna artist rendering

The discovery of a new ‘dwarf planet’ expands our view of the solar system

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Meet Biden, a new dwarf planet named after the vice president that’s upsetting the apple cart that is our understanding of the solar system. It, along with a relatively nearby neighbor, Sedna, are challenging astronomers to rewrite definitions of how the solar system formed.

Sedna artist rendering

The discovery of a new ‘dwarf planet’ expands our view of the solar system

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The World

Light years away: the discovery of ‘exo-planets’

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