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Chapter 11: Pluto and Dwarf Planets. Pluto: Ruler of the Underworld Pluto was discovered by Clyde Tombaugh in 1930 by comparing one image of the sky taken.

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Presentation on theme: "Chapter 11: Pluto and Dwarf Planets. Pluto: Ruler of the Underworld Pluto was discovered by Clyde Tombaugh in 1930 by comparing one image of the sky taken."— Presentation transcript:

1 Chapter 11: Pluto and Dwarf Planets

2 Pluto: Ruler of the Underworld Pluto was discovered by Clyde Tombaugh in 1930 by comparing one image of the sky taken one night with an image taken 6 nights later.

3 The discovery of Charon

4 HST discovers new moons!

5 What is Pluto?

6 Strange planet; located far out from the Sun with gas giants but small size and very elliptical and highly inclined orbit Pluto is a mixture of ices and rocks composition similar to satellites of giant planets than terrestrial planets Could be captured Kuiper Belt Object (e.g. comet)?

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9 A "planet" is a celestial body that: (a) is in orbit around the Sun, (b) has a nearly round shape (c) and has cleared the neighborhood around its orbit. 8 Planets ! IAU Definition

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11 A “dwarf planet is” a celestial body that: (a) is in orbit around the Sun, (b) has a nearly round shape (c) and is neither a star, a planet, or a moon 40 + Dwarf Planets !

12 Should Pluto be a Planet? Write down the three characteristics of a planet. Why is Pluto not a planet anymore? What type of object is it? In your opinion, should we keep Pluto as a planet? Why or why not?


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