1. How does weak background radiation coming from every direction in the sky support the Big Bang Theory?
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2 points
it provides evidence of universe contraction
it provides evidence of the universe's increasing mass
it provides evidence of the universe's decreasing mass
it provides evidence of universe expansion
it provides evidence of universe expansion
The weak background radiation coming from every direction in the sky, known as the cosmic microwave background (CMB), provides evidence of universe expansion, which supports the Big Bang Theory. Here's how this radiation supports the theory:
1. Measure the radiation: Scientists can measure the CMB using specialized instruments, such as telescopes and satellites, which are designed to detect microwave radiation.
2. Confirm its isotropic nature: The CMB is observed to be very uniform, meaning it has nearly the same intensity in all directions. This uniformity indicates that the radiation is coming from all directions in the sky.
3. Predicted by the Big Bang Theory: According to the Big Bang Theory, the universe began as a hot and dense state and has been expanding and cooling ever since. As the universe expanded, the radiation present at the beginning of the universe cooled down and spread out, resulting in the weak background radiation we observe today.
4. Key features match predictions: The CMB has specific features that align with what the Big Bang Theory predicts. For example, it follows a blackbody spectrum, meaning its intensity distribution matches that of a perfect radiator at a specific temperature. Additionally, the CMB has small temperature fluctuations that provide insights into the early structure formation of the universe.
5. Consistent with other evidence: The CMB's isotropy and other properties are consistent with other observations, such as the abundance of light elements like hydrogen and helium in the universe and the large-scale distribution of galaxies. Together, these pieces of evidence form a consistent picture of an expanding universe that started with a Big Bang.
In summary, the weak background radiation, known as the cosmic microwave background, supports the Big Bang Theory by providing evidence of universe expansion. The observed properties of the CMB align with the predictions of the theory and give insights into the early stages of the universe.
The weak background radiation coming from every direction in the sky supports the Big Bang Theory by providing evidence of universe expansion.
2. 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.