A huge planet that has never been seen by astronomers could be lurking, almost invisibly, at the dark edges of our solar system, some scientists believe.
By 1,846, astronomers had pinpointed all the eight main planets – and have since found several other ’dwarf planets’ including Pluto.
But the search goes on for the mysterious ‘ninth planet’ which is thought to sit far beyond Neptune in our solar system, said space expert Sara Webb.
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