The one we would come to call the Big Bang suggested the universe expanded rapidly from a primordial, hot, and ultra-dense cosmos. Conversely, the so-called 'Steady State' theory held that the universe, at any given point in time, looked roughly the same. The story of how the Big Bang became the accepted theory of physics is also a story of The Big Bang theory predicts how much of each element was made in the early universe. When astronomers look at very old galaxies and stars, the amount of each chemical they see agrees with the Big Bang theory. You cannot look for this evidence in new stars, like the Sun. The Big Bang theory roused the public and religious realms perhaps even more than the scientific community, which had previously accepted an idea called the steady state model. "It was not only a scientific controversy, it also included some broader aspects, ideological and religious aspects. And that was one reason why it was so publicly
Countless scientific tests of Einstein's general theory of relativity have been performed, subjecting the idea to some of the most stringent constraints ever obtained by humanity.
The apparent disparity between observation and theory ushered in the scientific revolution called the "quantum theory of the atom". In 1913 Neils Bohr proposed the quantum model to explain the hydrogen spectrum, and for the first time, there was a theory that precisely predicted the wavelengths of all the hydrogen spectral lines.
Hubble's discovery was the first observational support for Georges Lemaître's Big Bang theory of the universe, proposed in 1927. Lemaître proposed that the universe expanded explosively from an extremely dense and hot state, and continues to expand today. Subsequent calculations have dated this Big Bang to approximately 13.7 billion years TEwyHt.
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    • what is the scientific big bang theory