'Sedna' Planetoid Seen at Solar System's Edge Astronomers say they've found a large icy mass far beyond the orbit of Pluto. Scientists have declared it the most distant object in the solar system, at more than 8 billion miles from Earth. The planetoid, named Sedna, is estimated to be around 1,000 miles in diameter. NPR's Richard Harris reports.
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'Sedna' Planetoid Seen at Solar System's Edge

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'Sedna' Planetoid Seen at Solar System's Edge

'Sedna' Planetoid Seen at Solar System's Edge

'Sedna' Planetoid Seen at Solar System's Edge

  • Download
  • <iframe src="https://www.npr.org/player/embed/1768573/1768574" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Astronomers say they've found a large icy mass far beyond the orbit of Pluto. Scientists have declared it the most distant object in the solar system, at more than 8 billion miles from Earth. The planetoid, named Sedna, is estimated to be around 1,000 miles in diameter. NPR's Richard Harris reports.