Which evidence supports the idea that Cosmic Microwave Background radiation is a remnant of the Big Bang? *
Its mass fluctuates greatly.
Its temperature is uniform.
Its mass is uniform.
Its temperature fluctuates greatly.
The evidence that supports the idea that Cosmic Microwave Background radiation is a remnant of the Big Bang is that its temperature is uniform. The uniformity of the temperature across the entire sky suggests that the radiation was emitted from a single event that occurred in the early universe, such as the Big Bang.
The evidence that supports the idea that Cosmic Microwave Background (CMB) radiation is a remnant of the Big Bang is the fact that its temperature is uniform.
To understand why a uniform temperature of CMB radiation is evidence for the Big Bang, it is important to know a little about the early universe. The Big Bang is a scientific theory that suggests the universe began as a hot and dense state and has been expanding ever since. As the universe expanded, it cooled down, and about 380,000 years after the Big Bang, it reached a point where atoms formed and photons (particles of light) were able to move freely without being scattered by charged particles.
The CMB radiation is essentially the light that was produced at that specific point in time, known as the cosmic recombination era. This radiation has been traveling through space ever since, and it has gradually cooled down due to the universe's expansion.
The key evidence that connects the CMB radiation to the Big Bang is its uniform temperature. Scientists observe that no matter where they look in the sky, the temperature of the CMB radiation is almost exactly the same: approximately 2.7 Kelvin (-270.45 degrees Celsius or -454.81 degrees Fahrenheit). This uniformity is highly unlikely to occur naturally and indicates that the CMB radiation originated from a highly homogeneous and symmetrical event, such as the Big Bang.
If the temperature of the CMB radiation were to fluctuate greatly across the sky, it would suggest significant differences in the conditions at the time of its origin. However, the fact that it is uniformly distributed further supports the idea that it originated from an extremely hot and uniform early universe, lending strong evidence to the theory of the Big Bang.