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.
December 21, 2018
July 4, 2019