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Astronomers have detected what could be the Solar System's 10th planet.
It was first seen by astronomers using California's Mount Palomar Observatory, and has been given the name "Sedna" after the Inuit goddess of the ocean.
Observations show it measures about 1,180-2,360km (730-1,470 miles) across, making it similar in size to Pluto.
There is likely to be some debate about whether it qualifies as a true planet, but some scientists are already saying it re-defines our Solar System.
Further than Pluto
Sedna, or 2003 VB16, as it was originally designated, is the most distant object yet found orbiting our Sun. It is three times further away than Pluto (average distance to the Sun is 5.9 billion km or 3.6 billion miles).
It was discovered using the Mt Palomar facility in November by astronomers from the California Institute of Technology, Yale Observatory and the Gemini Observatory.
Follow-up studies by the Tanagra Observatory have measured the thermal radiation coming from Sedna to determine how hot it is, and therefore provide some estimate of its size.
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