The basic question "Why planets revolve around the Sun?", is explained by taking into account the heaviness of Sun. The lighter bodies are considered to move around heavier bodies,as like lighter planets are considered to move around heavier Sun.
The reason for lighter bodies moving around heavier bodies is said to be because of greater gravitational pull exerted by heavier bodies. But, I don't know why heavier bodies produce greater gravitational pull than lighter bodes.
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