Which evidence supports the idea that Cosmic Microwave Background radiation is a remnant of the Big Bang?(1 point)
Responses
Its mass fluctuates greatly.
Its mass fluctuates greatly.
Its temperature is uniform.
Its temperature is uniform.
Its temperature fluctuates greatly.
Its temperature fluctuates greatly.
Its mass is uniform.
Its mass is uniform.
Its temperature is uniform.
The evidence that supports the idea that Cosmic Microwave Background (CMB) radiation is a remnant of the Big Bang is that its temperature is uniform. This means that no matter where we observe the CMB radiation from in the universe, the temperature is almost the same in all directions. This uniformity is a strong indication that the CMB radiation was created during the early stages of the universe, as a result of the incredibly hot and dense conditions of the Big Bang.
The evidence that supports the idea that Cosmic Microwave Background (CMB) radiation is a remnant of the Big Bang is the uniformity of its temperature.
To understand how this evidence leads to that conclusion, we need to understand what Cosmic Microwave Background radiation is. CMB is a form of electromagnetic radiation that fills the entire universe and is present in all directions. It is considered the afterglow of the Big Bang, which is the event believed to have started the expansion of the universe.
The uniformity of CMB radiation's temperature is a crucial piece of evidence. According to the Big Bang theory, the universe was once in a hot, dense state. As the universe expanded, it cooled down and allowed matter and radiation to separate. Eventually, about 380,000 years after the Big Bang, the universe had cooled enough for neutral atoms to form, and light was able to travel freely through space. This light, which was in the form of photons, is what we now detect as CMB radiation.
If the Big Bang theory is correct, we would expect the CMB radiation to have a uniform temperature across the entire universe. This is because, before the formation of neutral atoms, the universe was in a state of thermal equilibrium, meaning that the temperature was the same everywhere. As the universe expanded, this uniform temperature was imprinted on the photons of CMB radiation.
Observations of the CMB radiation have indeed confirmed its uniformity to a remarkable degree. Sensitive measurements made by satellites, such as the COBE (Cosmic Background Explorer) and Planck missions, have shown that the temperature of CMB radiation is almost the same in all directions of the sky, with only small variations. These measurements strongly support the idea that CMB radiation is a remnant of the early hot and dense state of the universe predicted by the Big Bang theory.
Therefore, the correct answer to the question is: Its temperature is uniform.