Which evidence supports the idea that Cosmic Microwave Background radiation is a remnant of the Big Bang?
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2 points
Its mass is uniform.
Its temperature is uniform.
Its mass fluctuates greatly.
Its temperature fluctuates greatly.
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.
The Big Bang theory predicts that the universe originated from a singularity, an extremely hot and dense point. As the universe expanded, it cooled down, eventually leading to the formation of atoms and the release of photons. These photons, which make up the CMB radiation, have been traveling through space ever since.
One of the key predictions of the Big Bang theory is that the CMB radiation should have a uniform temperature. This prediction has been confirmed by measurements made by various satellite missions, including the Cosmic Background Explorer (COBE) and the Planck satellite. These measurements have shown that the CMB radiation has a nearly perfect blackbody spectrum with a temperature of about 2.7 Kelvin, which is extremely uniform across the entire observable universe.
On the other hand, the mass of the CMB radiation is not relevant in determining its nature as a remnant of the Big Bang. The CMB radiation consists of massless photons, and while it does contribute to the overall mass-energy density of the universe, the uniformity or fluctuations in its mass do not have a direct bearing on its origin as a remnant 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 uniform temperature of the CMB. This is because the Big Bang theory predicts that the universe started with a hot, dense state and has been expanding and cooling ever since. As the universe expanded, the radiation left over from the hot early state would have cooled down uniformly and now appears as the CMB radiation that we can observe today. Therefore, the uniform temperature of the CMB is consistent with the idea of it being a remnant from the Big Bang.
The evidence that supports the idea that the Cosmic Microwave Background (CMB) radiation is a remnant of the Big Bang is that its temperature is uniform.
To understand how scientists came to this conclusion, we need to go through the steps they took to study the CMB radiation.
First, in the 1960s, scientists accidentally discovered the CMB radiation. They observed that there was a relatively low-level microwave radiation coming from all directions in space, indicating a uniform distribution across the sky.
Next, they measured the temperature of the CMB radiation. They found that the temperature was extremely uniform, with only very small variations, around 2.7 Kelvin (or approximately -270.45 degrees Celsius).
This uniformity of temperature is important because it suggests that the CMB radiation originated from the Big Bang. According to the Big Bang theory, the universe began with a massive explosion that sent matter and energy in all directions. As the universe expanded and cooled down, the radiation left over from the initial explosion would have had its temperatures evened out. This would explain the uniform temperature observed in the CMB radiation.
If the temperature of the CMB radiation fluctuated greatly, it would imply that there were other processes or events occurring after the Big Bang that influenced its temperature distribution. However, the fact that its temperature is so uniform supports the idea that it is indeed a remnant of the initial explosion that occurred during the Big Bang.