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 (C)</p> Signup and view all the answers

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

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

What is the density of Eris?

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

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

<p>Dwarf Planet (B)</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 (A)</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 (D)</p> Signup and view all the answers

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

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

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

<p>Dysnomia (D)</p> Signup and view all the answers

How often does Eris rotate around its axis?

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

What is the density of Eris?

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

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

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

What is the approximate mass of Eris?

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

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