By measuring the CMB for redshift and comparing these to local distance measurements (using variable stars and supernovae), astronomers have sought to measure the rate at which the Universe is expanding.Īround the same time, scientists observed that the rotational curves of galaxies were much higher than their visible mass suggested. Thereafter known as the Cosmic Microwave Background (CMB), the existence of this relic radiation confirmed the Big Bang theory, which posits that all matter was condensed onto a single point of infinite density and extreme heat that began expanding ca. ![]() ![]() In the 1960s, astronomers began noticing a pervasive microwave background visible in all directions.
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