text: which planet can be found in the centre of the solar system? why are there nine planets in the solar system? i am in the center of the solar system. kidding.  the sun is in the center. that's why it's called the solar system. but mercury is the planet nearest to the sun.  new findings suggest that there could be ten planets in this solar system. the number of planets is random (or it appears to be). when the big bang happened, the sun attracted mass to itself as it oscillated, and the planets were formed.