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The steady state theory of the universe is that the universe was always there and always will be there. microwave radiation helped show that the universe was formed a certain way and was not always around. Cosmic radiation in the universe is like an echo that the telescope COBE was able to piece together to see what the early universe looked like. WMAP and CBI were created later to get a clearer picture. We found out that iron wasn't around before the big bang and we still aren't sure where it came from.