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'New planet' discovered

BBC Online
Astronomers have detected what could be die Solar System's 10th planet.
Found further away than other planets by die recently launched Spitzer Space Telescope, it has been called Sedna after the Inuit goddess oftheocean.
Observations show it is about 2,000 km across and it may even be larger than Pluto, which is 2,250 km across.
There is likely to be debate about whether it qualifies as a true planet, but some astronomers are already sayingitre-definestheSolar System.
The Hubble Space Telescope has alsoseenit.
Details will be announced by the US space agency Nasa later on Monday.
Sedna is the largest object found circling the Sun since the discovery of Pluto in 1930. Its size is uncertain.
One astronomer told BBC News
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Online that it may even be larger than Pluto itself.
It was found during the course of a survey led by Dr Michael Brown of the California Institute of Technology. Scientists are only midway through this three-year project.
Preliminary calculations suggest that it is lObn kilometres from Earth in a region of space known as the Kuiper Belt (KB).
The KB contains hundreds of known objects and astronomers believe there are many more awaiting discovery. Most are small worlds
of rock and ice but some, like Sedna, could be as large as or larger than Pluto.
The importance of Sedna is that it is the firstsuch world discovered in its normal orbit. Other similar though smaller worlds, like Quaoar and Varuna, originated in the KB but have since been perturbed Into different orbits.
Following the object’s discovery, astronomers at the Tenagra Observatory in Arizona were asked to provide positional Information so that an orbit could be determined for Sedna.
The new discovery will reignite the debate about what is a planet.
One group of astronomers believe that Pluto is not a true planet but merely one of the largest of a vast number of minor objects in the outerSoIarSystem.
The alternativestandpoint is that Pluto is a planet and those who believe that will have to classify Sednaas the tenth planet.