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What Is a Planet?

What Is a Planet? By NASA, ESA and G. Bacon (STScI) [Public domain], via Wikimedia Commons

Introduction

Have you ever wondered how scientists classify an object in space as a planet, a dwarf planet, a comet, or some other kind of space object? Go through the What is a Planet? slideshow on the student esheet Is Pluto a Planet? to learn more about the objects in space.


What is a Planet?

According to the International Astronomical Union (IAU), what are the characteristics of a planet?

 

 

What are some examples of planets?

 

 

According to the IAU, what are the characteristics of a dwarf planet?

 

 

What are some examples of dwarf planets?

 

 

Why might it be useful to define the characteristics of a planet or a dwarf planet?

 

 

 

 

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