Our solar system evolved from a collapsing cloud of hydrogen and small particals that formed a flattened spinning disk.(Our sun formed out of the center of this disk.)Under great pressure and temperture(about 15 million*)at the center of the sun,hydrogen atom's are fused together forming helium atom's,releasing energy to heat the sun.
During the next 20 million year's,the planet's formed gathering together small dust sized partical's to large rock and proto planet's,building strong gravitational field's that collected more matter and mass to become the planet's of our solar system.From the jovian giant Jupiter,to the smallest planet Pluto