The earliest and most direct observational evidence of the validity of the theory are the expansion of the universe according to Hubble's law (as indicated by the redshifts of galaxies), discovery and measurement of the cosmic microwave background and the relative abundances of light elements produced by Big Bang ...Two major scientific discoveries provide strong support for the Big Bang theory: • Hubble's discovery in the 1920s of a relationship between a galaxy's distance from Earth and its speed; and • the discovery in the 1960s of cosmic microwave background radiation.It is not only possible, it is absolutely certain that our understanding of the Big Bang is incomplete. Cosmic inflation is a widely accepted theory about what happened during the first fraction of a second during the Big Bang, but it is not proven.
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The earliest and most direct observational evidence of the validity of the theory are the expansion of the universe according to Hubble's law (as indicated by the redshifts of galaxies), discovery and measurement of the cosmic microwave background and the relative abundances of light elements produced by Big Bang ...Two major scientific discoveries provide strong support for the Big Bang theory: • Hubble's discovery in the 1920s of a relationship between a galaxy's distance from Earth and its speed; and • the discovery in the 1960s of cosmic microwave background radiation.It is not only possible, it is absolutely certain that our understanding of the Big Bang is incomplete. Cosmic inflation is a widely accepted theory about what happened during the first fraction of a second during the Big Bang, but it is not proven.