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The **Big Bang theory** of how the universe formed is best supported by evidence of radio waves detected in space. Specifically, the discovery of the Cosmic Microwave Background (CMB) radiation, which is a faint afterglow of the Big Bang, provides strong evidence for this theory. The CMB is a uniform background of microwave radiation that fills the universe and is thought to be the remnant heat from the early hot and dense state of the universe, providing key insights into its origins and evolution.