Planet Nine: Distant star system could help astronomers prove existence of Planet Nine

For decades, scientists have theorised there is a ninth planet – what would have been 10th were it not for the downgrade of Pluto to a dwarf planet – in Earth’s neighbourhood. The planet was believed to be 10 times bigger than Earth and 20 times farther out from the Sun than Neptune – the outer-most planet in the solar system – making it difficult for astronomers to spot. However, the Hubble telescope has spotted a planet orbiting so far out from its host star that it adds weight to the Planet Nine theory.

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