Since galaxies were formed after the CMB came into existence about 380,000 years after the BB, and those far away will wink out as they cross the cosmic horizon, why doesn't the CMB also wink out? I know the latter is reddening as the cosmos expands, and is ubiquitous, but when the question was posed to me last night at a meeting in Pasadena with former JPL colleagues, I didn't have a good answer. TIA, AG
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