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l Out-of-this World Name Sought for New Planet
Debate has begun on what to call the solar system's newly-discovered 10th planet.

l Astronomers Claim Discovery of 10th Planet
Astronomers announced Friday that they have discovered a new planet larger than Pluto in orbit around the sun.

·Moon of 'Tenth Planet' Discovered
The newly discovered moon is about 155 miles wide and 60 times fainter than Xena, the farthest-known object in the solar system.

·Study Continues on 10th Planet
Scientists from the Jet Propulsion Laboratory and Caltech are continuing this week to review data related to the recent discovery of the tenth known planet in our solar system.

·10th Planet Info Release Forced by Hacker
We have a hacker to thank for the recent release of information regarding the discovery of a 10th planet in our solar system.

The Kuiper Belt

The Kuiper Belt and The Oort Cloud
In 1950 Jan Oort noticed that
1. no comet has been observed with an orbit that indicates that it came from interstellar space,
2. there is a strong tendency for aphelia of long period comet orbits to lie at a distance of about 50,000 AU, and
3. there is no preferential direction from which comets come.

The Kuiper Belt

The Solar System

Definition of a Planet
Until the report of this Working Group is received, all objects discovered at a distance from the Sun greater than 40 AU will continue to be regarded as part of the Trans-Neptunian population.

Mysterious Sedna
March 15, 2004: NASA-funded researchers have discovered the most distant object orbiting the sun. It's a mysterious planet-like body three times farther from Earth than Pluto.

Planets
Planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.