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Thermal energy from the big bang is still present in cosmic background radiation. The first light to ever be able to travel freely throughout the Universe is the cooled remnant known as the Cosmic Microwave Background.
This "fossil" radiation, which can be seen with the furthest resolution by any telescope, was emitted shortly after the "Big Bang." It is regarded by scientists as an afterglow or "shockwave" of the Big Bang. According to the Big Bang theory, the early universe was an extremely hot place, and as it expanded, the gas inside of it cooled. Therefore, radiation known as the "cosmic microwave background," or CMB, which is essentially the leftover heat from the Big Bang, should be present everywhere in the cosmos. As the Universe grows, this remnant radiation from the Big Bang is getting more redshifted. As a result, its energy is continuously diminished. The current cosmic microwave background will no longer be seen in a few trillion years since it will have redshifted into insignificance. The cosmic microwave background, commonly referred to as "relic radiation," is electromagnetic radiation that is a holdover from an early stage of the universe and is explained by the Big Bang theory. All of space is filled with the feeble cosmic background radiation, or CMB. It is the oldest electromagnetic radiation in the universe, dating to the epoch of recombination when the first atoms were created, making it a significant source of information about the early universe. The background (the area between stars and galaxies) is completely dark when using a conventional optical telescope.
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