New telescope could finally prove there is an elusive 'Planet X' in our solar system
There are eight official planets (sorry, Pluto) in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and ...
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Planet X: Could Solar System hide a mysterious giant?
A few decades ago, the Solar System had nine planets, but in 2006 the International Astronomical Union reclassified Pluto as ...