How does the change in the temperature of the universe provide evidence for universe expansion that supports the Big Bang Theory?
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2 points
The universe is warming which, according to the Big Bang Theory, is expected to happen as the universe shrinks
The universe is cooling which, according to the Big Bang Theory, is expected to happen as the universe expands.
The universe is cooling which, according to the Big Bang Theory, is expected to happen as the universe shrinks.
The universe is warming which, according to the Big Bang Theory, is expected to happen as the universe expands.
The correct answer is: The universe is cooling which, according to the Big Bang Theory, is expected to happen as the universe expands.
According to the Big Bang Theory, the universe has been expanding since its initial explosion. As the universe expands, its density decreases and the radiation and matter within it spread out. This spreading out results in a cooling effect. Therefore, the cooling of the universe provides evidence for its expansion, supporting the Big Bang Theory.
The correct answer is: The universe is cooling which, according to the Big Bang Theory, is expected to happen as the universe expands.
According to the Big Bang Theory, the universe originated from a singular point in an event known as the Big Bang. From that moment, the universe has been expanding, with galaxies moving away from each other. As the universe expands, the space between galaxies also expands, leading to a phenomenon called redshift.
Redshift occurs when the wavelength of light from distant galaxies is stretched as the universe expands. This stretching of the light leads to a shift towards longer wavelengths, which corresponds to lower temperatures. Therefore, as the universe expands, the light from distant galaxies becomes redder, indicating a cooling of the universe.
This observation of cosmic microwave background radiation, which is a remnant of the early universe, provides strong evidence for the Big Bang Theory and the expansion of the universe.
The correct answer is "The universe is cooling which, according to the Big Bang Theory, is expected to happen as the universe expands."
To understand why this is the case, we need to delve into the concept of cosmic microwave background radiation (CMB). The Big Bang Theory proposes that the universe originated from a hot and dense state approximately 13.8 billion years ago. As the universe expanded, it began to cool down.
As a result of this cooling process, the energy from the early universe has been stretched and transformed into microwaves over billions of years. These microwaves now permeate the entire universe and are known as the cosmic microwave background radiation.
Observations of the cosmic microwave background radiation have shown that it is nearly uniform in all directions, indicating that it originated from a hot and dense state. However, there are tiny temperature fluctuations present. These fluctuations are very important because they provide evidence for the expansion of the universe.
The prevailing explanation for these temperature fluctuations is the theory of cosmic inflation. According to this theory, the early universe underwent a rapid expansion shortly after the Big Bang. During this inflationary period, quantum fluctuations were stretched to cosmological scales, leading to the formation of structures like galaxies and galaxy clusters.
The cooling of the universe is a direct consequence of its expansion. As the universe expands, the wavelengths of light and other radiation also stretch, causing a decrease in energy and temperature. Therefore, the fact that the universe is cooling provides strong evidence for its expansion, consistent with the predictions of the Big Bang Theory.