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The center body of the solar system is the Sun.
Because about 98 percent of the mass of the entire Solar System is concentrated in the Sun, it has gravitational predominance and does the least relative movement - the planets and other objects orbiting around it.
You mean - of THE solar system ?? That would be the sun.
The sun is the only luminous body in our solar system.
Jupiter is the largest planet in our solar system, but the Sun is the biggest body.
The Sun is the central and largest body of the Solar System - but it is not a planet.
The Earth and possibly Venus (but nothing has been confirmed, just suspected). Note: The moon Io of Jupiter is the most volcanically active body in the Solar System.
The solar system is in outer space. There are 8 planets in the solar system. They all rotate the sun. The body organ system is a completely different thing. Figure it out.
But ... there are many bodies in our Solar system that have no atmosphere.
Mercury had volcanic activity but it appears to be dormant nowVenus had volcanic activity but it appears to be dormant nowEarth still has active volcanoesMars had volcanic activity but it appears to be dormant nowIo - a moon of Jupiter is the most volcanically active object in our Solar System with over 400 active volcanoes.
Jupiter's moon Io is the most volcanically active body in the solar system with over 400 active volcanoes. The volcanoes on Io produce lavas made of molten sulfur.
The central body of every solar system is a star.