08-25-2006, 12:21 AM
<img src='http://newsimg.bbc.co.uk/media/images/42012000/jpg/_42012422_solar_system_planets3_416.jpg' border='0' alt='user posted image' />
http://news.bbc.co.uk/2/hi/science/nature/5282440.stm
Pluto loses status as a planet
Artist's impression of Pluto, BBC
Pluto's status has been contested for many years
Astronomers have voted to strip Pluto of its status as a planet.
About 2,500 scientists meeting in Prague have adopted historic new guidelines that see the small, distant world demoted to a secondary category.
The researchers said Pluto failed to dominate its orbit around the Sun in the same way as the other planets.
The International Astronomical Union's (IAU) decision means textbooks will now have to describe a Solar System with just eight major planetary bodies.
Pluto, which was discovered in 1930 by the American Clyde Tombaugh, will be referred to as a "dwarf planet".
There is a recognition that the demotion is likely to upset the public, who have become accustomed to a particular view of the Solar System.
Named after underworld god
Average of 5.9bn km to Sun
Orbits Sun every 248 years
Diameter of 2,360km
Has at least three moons
Rotates every 6.8 days
Gravity about 6% of Earth's
Surface temperature -233C
Nasa probe visits in 2015
http://news.bbc.co.uk/2/hi/science/nature/5282440.stm
Pluto loses status as a planet
Artist's impression of Pluto, BBC
Pluto's status has been contested for many years
Astronomers have voted to strip Pluto of its status as a planet.
About 2,500 scientists meeting in Prague have adopted historic new guidelines that see the small, distant world demoted to a secondary category.
The researchers said Pluto failed to dominate its orbit around the Sun in the same way as the other planets.
The International Astronomical Union's (IAU) decision means textbooks will now have to describe a Solar System with just eight major planetary bodies.
Pluto, which was discovered in 1930 by the American Clyde Tombaugh, will be referred to as a "dwarf planet".
There is a recognition that the demotion is likely to upset the public, who have become accustomed to a particular view of the Solar System.
Named after underworld god
Average of 5.9bn km to Sun
Orbits Sun every 248 years
Diameter of 2,360km
Has at least three moons
Rotates every 6.8 days
Gravity about 6% of Earth's
Surface temperature -233C
Nasa probe visits in 2015