Answer :
The electromagnetic byproducts of the explosion that gave birth to the cosmos are the cosmic background radiation.
The first light to ever be able to move freely throughout the universe is the Cosmic Microwave Background (CMB), which has since been cooled. The 'Big Bang' was followed by the release of this 'fossil' radiation, which is the farthest that any telescope can observe. It is seen by scientists as a "shockwave" or echo of the Big Bang.
The flimsy great bang light is preserved in the cosmic microwave background radiation. About 2.5 percent of the sky is covered by this false-color image, which depicts variations in the ionized gas that eventually condensed to form superclusters of galaxies.
A form of radiation called cosmic background radiation is one in which photons can move around freely since the universe has been transparent to radiation since the Big Bang.
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