Due date: March 21, 2014The Big BangJacob BowermanWhen astronomers talk about the birth and evolution of the universe, they refer to the development of space-time, the space itself expanding as time advances from the creation of the universe, otherwise known as the Big Bang. According to the Big Bang theory, the universe began by expanding from a very small volume with incredibly high density and temperature. With the Big Bang, the fabric of space itself began to expand, matter simply moved through space, stretching. The Big Bang happened 14 billion years ago, that's when all time, space and matter began. In a fraction of a second, the universe went from the size of a single atom to that of a galaxy. This was not the end of its expansion, it continued to expand at a fantastic rate, even today it continues to expand. As the universe expanded and cooled, energy was transformed into particles of matter and antimatter. Over the next three minutes, the temperature dropped below a billion degrees Celsius, meaning it was then cold enough for protons and neutrons to come together, forming hydrogen and hydrogen nuclei. 'helium. After 300,000 years, the temperature of the universe cooled to about 3,000 degrees. Atomic nuclei could then finally capture electrons to form atoms. The universe then filled with clouds of hydrogen and helium. In the early 1900s, most people thought the universe was of a fixed size. A range of new possibilities then opened up in 1915, when Albert Einstein developed his theory of general relativity which describes the nature of space, time and gravity. In 1917, an astronomer named Willem De Sitter applied Einstein's theory to the entire universe, and middle of paper ......and upon arriving at the universe, we imagined a dense, hot beginning of our universe 13.7 billion years old. there is in the past. After the universe began to expand, it cooled, going from extremely small to the size and temperature of our current universe. In the middle of this century, we discovered that nuclear reactions in this hot early universe precisely explain the previously mysterious abundance of helium and deuterium. However, we detected a faint glow after the Big Bang 13.7 billion years ago. The theory that the universe began with the Big Bang is one of the most profound discoveries ever made by man. The Big Bang theory is, however, a comprehensive description of the beginning of time, matter and space. Today, physicists have coherent theories about the history of the universe up to just a trillionth of a second after the birth of the universe, or even before..