Earth is not located in the center of the universe. It is a planet orbiting the sun(a star) in the Milky Way Galaxy.
The early universe consisted only of hydrogen, helium and a trace of lithium. All other elements are manufactured by Stars, when they combine through nuclear fusion.
These elements congregate to form other stars and planets.
When these stars die (nuclear fission), the atoms are released and the galaxy recycle them to form new stars and planets.
