Chapter 11: Part 1 Pluto and the Dwarf Planets. Pluto was discovered by Clyde Tombaugh in 1930 by comparing one image of the sky taken one night with.

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Presentation transcript:

Chapter 11: Part 1 Pluto and the Dwarf Planets

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. Pluto: Ruler of the Underworld

The discovery of Charon

Charon and Pluto

HST discovers new moons! 2012

Strange object; 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 Could be captured Kuiper Belt Object (e.g. comet)? What is Pluto?

Pluto’s strange orbit

Quaoar, Sedna, Earth, Moon, and Pluto size comparisons

10 th Planet???

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

Planets sweep up all the material along their orbit

Pluto’s strange orbit

Dwarf Planet Orbits are Strange

A “dwarf planet is” a celestial body that: (a) is in orbit around the Sun, (b) has a nearly round shape (c) has not cleared the neighborhood around its orbit and is not a satellite 5+ Dwarf Planets ! Dwarf Planet Definition

New Horizons visits Pluto July 2015

Pluto revealed!

Pluto and Charon