Does the Oort cloud really exist?

Yes, it does. Jan Oort asked: where do all those comets come from? It seems that only the presence of an icy cloud of cosmic objects can explain the existence of comets and the gravitational pull on the solar system. The cloud would starts from about 2000 au (astronomical unit = 150 million kilometers).

Also, it seems that there might also be another planet, 10x bigger than Earth around that area, but we need more proof.

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