A handout photograph made available by Caltech CATECH on 21 January 2016 showing an artistic rendering of a distant view from Planet Nine back towards the sun. - EPA
PARIS: In the mid-19th century, astronomers hypothesised an extra planet in our solar system, orbiting between the Sun and Mercury.
Without ever seeing it, they calculated its orbit and named it Vulcan – the only explanation, they thought, for small deviations in Mercury’s own orbit.
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