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" ... Only when the Universe expands so sufficiently that there are no longer enough high-energy photons left to ionize those atoms can neutral atoms stably form: a process requiring hundreds of thousands of years. Once those neutral atoms do form, those leftover photons simply travel through the Universe, too long in wavelength to interact with those atoms. Over the billions of years since, they should redshift all the way into the microwave part of the spectrum: a cosmic microwave background (CMB). With the right equipment — a Dicke radiometer, pioneered by group leader Bob Dicke — they could finally detect it. ... "