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In 1965, Arno Penzias and Robert Wilson published a scientific study which proved that a radio signal with a wavelength of 7.3 cm was being emitted uniformly throughout all parts of the sky. This signal became known as cosmic microwave background
radiation. Penzias and Wilson won the Nobel Prize in physics in 1978 for their findings. It is believed that this cosmic static is comprised of photons of energy that are still cooling 15 billion years after the Big Bang.