alien planet could be "hidden inside the centre of the Earth", a shock study claims.Experts think that a rogue planet called Theia which may have collided with the Earth could have left bits of itself within our planet's interior.Some scientists think the same impact in space formed the Moon but now they have studied the specific traces of the clash that remain buried deep in the Earth's mantle.Qian Yuan, a geology expert at Arizona State University in the US, think the mysterious dense spots in our planet's interior are specific pieces of Theia that are still intact inside Earth.
In a paper presented at the Lunar and Planetary Science Conference, Yuan and his team explain: "Here, we demonstrate that Theia's mantle may be several %.
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