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The idea of Planet X isn’t a new one; scientists have been actively pursuing its presence in our galaxy for the best part of 100 years now.

One of the first was astronomer Clyde W Tombaugh, who inadvertently discovered Pluto – which he initially gave the temporary name ‘Planet X’ for 10th planet – while scanning the skies for a Neptune-sized body causing anomalies in both Uranus’s and Neptune’s orbits during the 1930s. Unfortunately for Tombaugh, Pluto was far too small – a mere 0.2 per cent the size of Earth – to exert the force required to create such anomalies.