Why Is Cosmic Microwave Background So Cold?

infused throughout space about 400,00 years after the big bang. A reason why scientists have concluded that cosmic microwave background is so cold is because the light that was infused into space spread out into very long distances. As this happened, the wavelengths became less powerful and weak. Currently, the estimated temperature of cosmic microwave radiation is roughly 3Kelvin. The cosmic microwave background was discovered about fifty years ago in the 1960s by two astronomers named Robert Wilson and Arno Penzias. Both, had the opportunity to discover cosmic radiation through a microwave antenna called Holmdel horn. The radiation that was launched into outer space when the explosion occurred, eventually cooled down. The temperature in