Sedna?

Astronomers find 'new planet'
A new space telescope has detected what could be the Solar System's 10th planet, named Sedna. [BBC News]
Found further away than other planets by the recently launched Spitzer Space Telescope, it has been called Sedna after the Inuit goddess of the ocean.

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 saying it re-defines the Solar System.


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