All the planets of our solar system, including Earth, rotate around Sun. The reason is gravity. Sun's gravity pulls all the planets towards it and causes them to revolve around it. This motion can be traced back to the formation of these planets. The Sun is our star and like all other stars is made from hot gases in the plasma state.
The Sun is our nearest star. It is, as all stars are, a hot ball of gas made up mostly of Hydrogen. The Sun is so hot that most of the gas is actually plasma, the fourth state of matter. ("NASA - Sun-Earth Connection," nasa.gov)
Though acted upon by gravity, these hot gases (mostly hydrogen) are spinning at high rates, so high that some plasma escapes the Sun's gravity as solar wind.
Newton's law of universal gravitation states that all bodies exert a gravitational pull proportional to mass (and inversely proportional to distance) on each other, and the Sun, being more massive than planets, is capable of gravitationally pulling planets.
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