We all know about 8 official planets in our Solar System. But what if I tell you there could be one more planet hiding out there right beyond Neptune? Planet Nine is believed to be the size of Mars... Let's get to know some of the most fascinating space facts! Including how many planets scientists have found outside of our Solar System: some of them are dense as iron and others are airy and light.

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Free-floating planet CFBDSIR J214947.2-040308.9 (artist’s impression): By ESO/L. Calçada/P. Delorme/R. Saito/VVV Consortium - [ Ссылка ], CC BY 4.0 [ Ссылка ], [ Ссылка ]
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