Describes the discovery of Pluto, the ninth planet, what has been learned about it, and the current controversy over whether it is a planet at all.

Learn about this fascinating planet in our Solar System.

Describes the discovery and observation of the ninth planet, Pluto, and what has been learned about its orbit, its makeup, and its moon.

Describes Pluto, the ninth planet from the sun in our solar system, and compares it to Earth.

"When Venetia Burney's grandfather reads aloud from the newspaper about a new discovery--a "ninth major planet" that has yet to be named--her eleven-year-old mind starts whirring. She is studying the planets in school and loves Roman mythology. "It might be called Pluto," she says, thinking of the dark underworld. Grandfather loves the idea and contacts his friend at London's Royal Astronomical Society, who writes to scientists at the Lowell Observatory...

What's cold, dark, far away, and has a "heart" one thousand miles wide? Pluto! The New Horizons spacecraft has brought back all kinds of new information about Pluto. Let's go exploring!--