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Astronomy

Planets

Pluto

Until 2006, Pluto was the ninth and smallest planet in the solar system.  Then Eris was discovered, and the whole planet debate blew up... badly.  Pluto, on average, is 40 AU from the sun and at the inner edge of the Kuiper Belt.  Very similar to Triton, Pluto is cold, and heading toward the aphelion of its orbit, where even its atmosphere will freeze out.

Neptune and Pluto

Pluto: I'm a planet, damn it! - CultureLab - New Scientist

Pluto - Wikipedia, the free encyclopedia

Is Pluto a Planet After all?

Planet Pluto, Pluto the Planet, Pluto Planet at SPACE.com

NASA - Pluto

Why is Pluto Not a Planet | Universe Today

Debate over Pluto Rages on

Pluto is a Planet!

Pluto

Pluto Not a Planet, Astronomers Rule

Is Pluto a Planet or Not?

Dwarf Planet Pluto

Why is Pluto now longer a planet?

YouTube - Why Isn't Pluto a Planet Any More?

Why We Love Pluto

Planet Pluto

Pluto Is Not a Planet - Explore the Cosmos | The Planetary Society (to be honest, I'm not fond of Neil deGrasse Tyson)

The Space Review: Demote Pluto, or demote "planet"?

A Short History of Pluto, the un-Planet

New Horizons Web Site

New Horizons, Pluto and the Kuiper Belt: Ice Worlds Beyond the Solar System (2014) (pdf)

Presentations

Planets (General)

Neptune

Eris

Smaller objects from the Outer Solar System

Moons

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