OBSERVATION SUPPORTING BIG BANG THEORY
Cosmic Background Radiation: One of the key pieces of evidence for the Big Bang theory is cosmic microwave background radiation (CMB). This is a faint glow of light that fills the universe, and it has a temperature of about 2.7 Kelvin. The CMB is thought to be the afterglow of the Big Bang, as it has a nearly perfect blackbody spectrum and is almost, but not quite, the same temperature in all directions.
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