It's another world . . . but is it our 10th planet?
NASA is expected to announce today the discovery of the space object, which some experts believe could be a new planet. It is provisionally known as Sedna, after the Inuit goddess of the sea.
Measurements suggest Sedna's diameter is almost 2000km – the biggest find in the solar system since Pluto was discovered 74 years ago. It is believed to be made of ice and rock, and is slightly smaller than Pluto.
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