Pluto: Orbit, Rotation, Surface, Atmosphere, and Moons
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Questions and Answers

What caused Pluto's change in classification?

  • The discovery of Ceres
  • The discovery of Eris (correct)
  • The change in mass of Eris
  • The change in size of Pluto

    • How does Eris compare to Pluto in terms of size?

  • Eris is initially thought to be larger than Pluto (correct)
  • Eris is the same size as Pluto
  • Eris is closer to the Sun than Pluto
  • Eris is much smaller than Pluto

    • Why was there confusion around how to classify Eris?

  • Its density was unknown
  • Its orbit passed beyond the Kuiper Belt
  • Its distance from the Sun made classification difficult (correct)
  • Its size was similar to Pluto

    • What decision did the IUA make regarding Eris and Pluto in 2006?

    <p>Identified Eris as a dwarf planet and changed Pluto's classification to a planet</p> Signup and view all the answers

    Which moon orbits Eris?

    <p>Dysnomia</p> Signup and view all the answers

    What is the radius of Eris?

    <p>$722$ miles $(1,163$ km$)$</p> Signup and view all the answers

    How often does Eris orbit the Sun?

    <p>$557$ Earth years</p> Signup and view all the answers

    What makes Eris the most massive of all known dwarf planets?

    <p>$16,600,000,000,000,000,000,000$ km mass</p> Signup and view all the answers

    What very little is known about regarding Eris?

    <p>Its atmosphere</p> Signup and view all the answers

    Which prediction do scientists make about dwarf planets in the solar system?

    <p>$100$ additional dwarf planets will likely be classified</p> Signup and view all the answers

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