14. How do scientists know that the universe is expanding?
A. The galaxies are moving away from each other, and the temperatures are decreasing.
B. The galaxies are moving away from each other, and the temperatures are increasing.
C. The galaxies are moving toward each other, and the temperatures are increasing.
D. The galaxies are moving toward each other, and the temperatures are decreasing.
Answer (3)
the galaxies are moving away from each other and the temps are decreasing
The universe is expanding is as the galaxies are moving away from each other, and the temperature of the universe is decreasing. Therefore, option (1) is correct.
How is the universe expanding?
First scientists theorized that as the universe is expanding and its temperature has gradually decreased. The universe has been expanding since the Big Bang and, as it expands, it’s temperature cooling down.
The temperature of the universe can be measured by looking at the cosmic microwave background (CMB). The temperature an be estimated by the thermal radiation left over from the Big Bang .
The CMB scientists have been investigating that its temperature has been dropping off gradually as our universe expands out and the current average temperature of the cosmos is estimated about 2.73 Kelvin.
The point of the Big Bang from the Big bang theory is described as dense singularity and infinitely hot . The energy from the Big Bang distributed as the universe expands and gives the cooling effect .
But new research suggests otherwise that the temperature of the earth is actually increasing as it expands. Therefore, the temperature of universe increasing with its expansion .
Learn more about universe expanding , here:
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The universe is expanding because galaxies are moving away from each other, which is evidenced by redshift observations. Additionally, the cosmic microwave background radiation supports this idea, showing that the universe has cooled since the Big Bang. Based on these points, the correct answer is option B: The galaxies are moving away from each other, and the temperatures are increasing.
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