A Japanese team believes there may be a planet 70% the size of Earth at the far reaches of the solar system. As I still recognise Pluto as a planet, that would make it the 10th.
The researchers atin western Japan said calculations using computer simulations led them to conclude it was only a matter of time before the mysterious “Planet X” was found.
“Because of the very cold temperature, its surface would be covered with ice, icy ammonia and methane,”Tadashi Mukai, the lead researcher, told AFP.
The study by Mukai and researcher Patryk Lykawka will be published in the April issue of the US-based Astronomical Journal.
“The possibility is high that a yet unknown, planet-class celestial body, measuring 30 percent to 70 percent of the Earth’s mass, exists in the outer edges of the solar system,” said a summary of the research released by Kobe University.
“If research is conducted on a wide scale, the planet is likely to be discovered in less than 10 years,” it said.