The evidence for 'Planet X' - the mysterious hypothesised planet on the edge of our solar system - has taken a new turn thanks to the mathematics of a noted astronomer.
Rodney Gomes, an astronomer at the National Observatory of Brazil in Rio de Janeiro, says the irregular orbits of small icy bodies beyond Neptune imply that a planet four times the size of Earth is swirling around our sun in the fringes of the solar system.
Planet X - perhaps mis-named now that Pluto has been demoted to a dwarf planet - has been widely hypothesised for decade, but has never been proven.
Gomes measured the orbits of 92 Kuiper belt objects - small bodies and dwarf planets - and said that six objects appeared to be tugged off-course compared to their expected orbits.
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