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

What caused Pluto's change in classification from a planet to a dwarf planet?

  • The decision made by the IUA in 2006
  • The discovery of Eris in 2005
  • The size similarity between Pluto and Eris (correct)
  • The naming of Eris after a Greek goddess

    • Why did Eris initially cause confusion around its classification?

  • It was located closer to the Sun than Pluto
  • It is three times farther away from the Sun than Pluto (correct)
  • Its orbit was in the opposite direction of Pluto's
  • Its mass was significantly smaller than that of Pluto

    • Which goddess is Eris named after?

  • Eris (correct)
  • Athena
  • Hestia
  • Hera

    • What is the radius of Eris?

    <p>1,163 km</p> Signup and view all the answers

    How long does it take for Eris to orbit the Sun?

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

    What is the density of Eris?

    <p>2.43g/cm³</p> Signup and view all the answers

    After Eris was discovered, what was its classification decided to be by the IUA?

    <p>Dwarf Planet</p> Signup and view all the answers

    How does Eris compare to Pluto in terms of size?

    <p>Eris was initially thought to be larger than Pluto</p> Signup and view all the answers

    What significant decision was made by the IUA in 2006 regarding Eris and Pluto?

    <p>Pluto was reclassified as a dwarf planet</p> Signup and view all the answers

    How far is Eris located from the Sun compared to Pluto?

    <p>Three times farther</p> Signup and view all the answers

    What is the name of the moon known to orbit Eris?

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

    How often does Eris rotate around its axis?

    <p>Once every 25.9 hours</p> Signup and view all the answers

    What is the density of Eris?

    <p>$2.43g/cm^3$</p> Signup and view all the answers

    Which goddess is Dysnomia, Eris' moon, named after?

    <p>None of the above</p> Signup and view all the answers

    What is the approximate mass of Eris?

    <p>$16.6 imes 10^{21} km$</p> Signup and view all the answers

    What is unique about Eris's orbit compared to other dwarf planets?

    <p>$3$ times farther from the Sun than other dwarf planets</p> Signup and view all the answers

    What do scientists predict about the number of additional dwarf planets yet to be discovered?

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

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