I have been googling Cosmic Background Radiation, but am still confused as to the location of its source. Is it just very old light finally arriving from very distant sources? Or is earth also surrounded by nearby CBR sources that in the fullness of time will arrive at very distant galaxies?
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It’s the “leftover” energy from the big bang.
If there was no CBR at all then the temperature in the vacuum of space should be “absolute zero”, the coldest temperature possible because ALL possible energy has been removed from a system (zero kelvin or -273.15°C). This leftover energy means that space is actually around 3° above absolute zero (and the coldest temperature we know of in the universe is actually found on earth where we do research in systems cooled to within a fraction of absolute zero).
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