Which is the middle planet of solar system

Dear Student,
Given that now there are only 8 planets considered in the solar system, it is not possible to declare any, one planet as the centre. However, there happens to be a hypothetical planet by the name Phaeton, which got disintegrated to form the asteroid belt, between the planets of Mars and Jupiter. 
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Our entire?solar system?also has a barycenter. The sun, Earth, and all of the planets in the?solar system?orbit around this barycenter. It is the center of mass of every object in the?solar system?combined.

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