Why is the earth round?

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Science, big bang One day the universe was born. The temperature of the universe was at first. After the explosion, the universe expanded rapidly. As the temperature decreases. The first is caused by the reduction in the temperature of the particulate. Quarks, protons, electrons, neutrons, neutrinos, etc..
After the creation of the force of attraction between the particles for their acts. The attraction force of the gravitational force and the weak nuclear force. Particulate matter began to come closer to each other. The temperature was still falling. As the particles come closer, accumulated the strength of attraction between them. As a result, electron, proton and neutron of the atomic gas. The force of attraction between the atoms in action. As a result, began to frequent the atoms in the gas.