To complete your sentence, the temperature of the background radiation is approximately 2.7 Kelvin. This temperature corresponds to the Cosmic Microwave Background (CMB) radiation, which is a remnant from the early universe, specifically from about 380,000 years after the Big Bang when the universe cooled enough for protons and electrons to combine to form neutral hydrogen atoms. This event allowed photons to travel freely, leading to the CMB we observe today. By studying this radiation, astronomers can gain insights into the conditions of the universe as it was around 13.7 billion years ago.
To astronomers accidentally discovered background radiation which is evidence of universe expansion that supports the Big bang theory this is particularly stronger evidence because it's temperature is ____ by observing this today you can see what the universe look like 137000000years ago
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