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Through a computer-simulated study, astronomers at Lund University in Sweden show that it is highly likely that the so-called Planet 9 is an exoplanet. This would make it the first exoplanet to be discovered inside our own solar system. The theory is that our sun, in its youth some 4.5 billion years ago, stole Planet 9 from its original star. Listen to Alexander Mustill as he explains! An exoplanet or extrasolar planet is a planet that orbits a star other than the Sun
originally posted by: gortex
a reply to: intrptr
Until it's confirmed and officially named planet 9 it is , although I vote we call it Nibiru.