The debate about an undiscovered planet X or planet 9 has been going on for more than 100 years.
Articles on Planet X
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The Solar System as we know it doesn’t really make sense without a ninth planet. So then why can’t we find it?
Whether you call it Planet X or Planet Nine, talk of another planet lurking in our Solar system won’t go away. So what does the discovery of a new object – nicknamed “The Goblin” – add to the debate?
