Dwarf Planets of the Solar System: Pluto, Eris, Haumea & Ceres


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In what decade was Pluto's designation as a planet first called into question?

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1. What is the IAU's definition of a dwarf planet?

2. Why was Pluto ultimately reclassified as a dwarf planet?

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About This Quiz & Worksheet

This quiz and corresponding worksheet will assess your knowledge of dwarf planets Pluto, Eris, Haumea, and Ceres. Topics you'll need to know include when Pluto's designation as a planet was first called into question and the definition of a dwarf planet according to the International Astronomical Union (IAU).

Quiz & Worksheet Goals

Use this printable worksheet and quiz to review:

  • When Pluto's status as a planet was first called into question
  • Definition of a dwarf planet according to the IAU
  • Cause of Pluto's reclassification
  • Number of possible dwarf planets in our solar system
  • Dwarf planet not in the Kuiper belt

Skills Practiced

  • Reading comprehension - ensure that you draw the most important information from the related natural science lesson
  • Interpreting information - verify you can review information regarding Pluto's reclassification and interpret it correctly
  • Knowledge application - use your knowledge to identify how many dwarf planets may exist in our solar system

Additional Learning

For more on these celestial objects, review the corresponding lesson titled Dwarf Planets of the Solar Sytem: Pluto, Eris, Haumea & Ceres. This lesson will help you:

  • Define dwarf planet
  • Identify when the definition of a dwarf planet was adopted and by what organization
  • Understand what first brought Pluto's status into question by astronomers
  • Appreciate the other dwarf planets currently known and their locations