It turns out that Sedna is not moving in the way everyone expected – tracing elliptical rings around the Sun, from within the Kuiper Belt. Instead, this dwarf planet takes a bizarre and unexpected path, swinging from just 76 Earth-Sun distances (roughly 11 billion k/7 billion miles) from the centre of our solar system to more than 900 (roughly 135 billion km/84 billion miles). Its orbit is so meandering, it takes 11,000 years to complete – the last time Sedna was at its current position, humans had only just invented farming.

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