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The Perception of Pluto
Topic: Outer Solar System
Summary: Scientists recently gathered to debate the recent IAU decision to demote Pluto from 'planet' status. Pluto may be small, but objects like Pluto still undergo important geophysical processes that can teach us about planetary formation.

Renaming Pluto
Topic: Outer Solar System
Summary: The International Astronomical Union has defined new rules for naming and categorizing dwarf planets. Those similar to Pluto and with orbits beyond Neptune will now be named 'plutoids'.

The Solar System's Ice Machine
Topic: Outer Solar System
Summary: Frigid geysers may be spewing material up through cracks in Charon and coating parts of its surface in ice crystals. The new observations suggest that liquid water might actually persist deep below the ultra-cold surface of Charon.

Eris Outweighs Pluto
Topic: Outer Solar System
Summary: Astronomers have discovered that the dwarf planet Eris is more massive than Pluto, and is likely composed of rock and ice. Objects in this little-known region of space, known as the Kuiper Belt, are important relics of the early Solar System and can teach us about a period of time when the Earth was first forming.

Speeding by Jupiter
Topic: Outer Solar System
Summary: The New Horizons spacecraft has collected new data on the Jupiter system, providing new views of the giant planet's atmosphere, rings, moons and magnetosphere.

Questioning Dwarfs
Topic: Outer Solar System
Summary: In the final part of this five-part lecture given at NASA´s Jet Propulsion Laboratory, Michael Brown answers questions from the audience. Questions include "Why did the name of Xena get changed to Eris?" and "Could there be another undiscovered planet in our solar system?"

Studying Dwarf Planets
Topic: Outer Solar System
Summary: In this lecture, Michael Brown talks about Eris, the dwarf planet he discovered, and discusses other intriguing findings in the farthest reaches of our solar system.

The Discovery of Eris
Topic: Outer Solar System
Summary: In this lecture, Michael Brown talks about his discovery of the dwarf planet, Eris. He also explains how scientists take a tiny point of light in the night sky and figure out how big it really is.

Hunting Distant Dwarfs
Topic: Outer Solar System
Summary: In this lecture, Michael Brown talks about the discovery of Pluto in 1930, and explains how scientists today find other distant objects in the Kuiper Belt.

Defining Planets
Topic: Outer Solar System
Summary: In this lecture, Michael Brown discusses the controversy over Pluto's demotion to a "dwarf planet" and what that means for our scientific understanding of the solar system.

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