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  Astronomers discover 'new planet'
Updated 15 March 2004, 16.14
The Spitzer telescope
A new planet may have been discovered at the far edge of the Solar System.

Astronomers detected Sedna using the Spitzer Space Telescope 6.2 billion miles (10 billion km) from Earth, but some say it's not really a planet.

Made of rock and ice, and about 1,200 (2,000 km) across, it could be bigger than Pluto, its closest neighbour.

One group of scientists don't even think Pluto is a real planet, but others say Sedna will change the way we think about our Solar System.

Sedna was named after the Inuit goddess of the Ocean.

It was discovered in a part of space called the Kuiper Belt, which is packed with hundreds of objects made of rock and ice.

It's thought that they are the left-overs from the creation of the Solar System.




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