Albert Einstein was a German-born mathematician and Physicist, considered one of the most influential scientific figures of the 20th century. Perhaps, more people know Einstein because of the world-famous equation, E=mc^2. Albert Einstein is popular across the whole/entire world for his remarkable theory, Theory Of Relativity. Nonetheless, he won the Nobel Prize in physics for his explanation of the photoelectric effect in 1921.

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All the space, matter, and energy of the Known universe was contained/compressed in an infinitesimal point (Primeval Atom:  unimaginably small, dense, and hot), nearly 14 billion years earlier. Cosmologists call this ‘The Big Bang Theory’. The big bang is not about the origin of the universe, but rather about the evolution of the universe. Why? The hurdle is the “Planck era” of the early universe — the interval of time from t = 0 to t = 10^-43 seconds into the expansion of the universe. And also until the universe grew to 10^-35 meters. Cosmologists call such an infinitesimal point a Singularity, the point where space and time become meaningless. At that time, the universe was extremely small that none of the laws of classical physics turns out to be effective. The explanation of the universe on the subatomic scale: It all comes down to quantum physics, more generally, quantum cosmology. At the earliest moments of the big bang, matter and energy were inseparable. Moreover, the four fundamental forces (actually three) that jointly describe these vast cosmos were unified. At the end of the Planck era, the gravity had separated from the electronuclear force.

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