which is the evidence of the universe expansion that supports the big bang Theory? the temperature of the universe has cooled over time
the temperature of the universe is the same as it was at the time of the big bang
the temperature of the universe has cooled and warmed repeatedly over time
the temperature has warmed over time
The evidence of the universe expansion that supports the Big Bang Theory is the cooling of the universe over time. According to the theory, the universe initially started as a hot and dense state during the Big Bang and has been expanding ever since. As the universe expands, the energy and temperature of the universe decrease. This cooling effect is observed as the cosmic microwave background radiation, which is considered one of the key pieces of evidence for the Big Bang Theory.
The correct answer is that the evidence of the universe expansion that supports the Big Bang Theory is that the temperature of the universe has cooled over time. As the universe expands, the wavelengths of light emitted by objects in space stretch, causing the light to become "redshifted" or shifted towards longer wavelengths. Scientists have observed this redshift in the light from galaxies, indicating that the universe is expanding and that objects are moving away from each other. Additionally, by measuring the cosmic microwave background radiation, which is the remnant heat from the early universe, scientists have found that the temperature of the universe has cooled over time, further supporting the Big Bang Theory.
The evidence of the universe expansion that supports the Big Bang Theory is the cooling of the universe over time. This phenomenon is known as cosmic microwave background radiation.
To understand this evidence, let me explain how scientists arrived at this conclusion. One of the key aspects of the Big Bang Theory is the idea that the universe started from an extremely hot and dense state, and then expanded and cooled over time. As the universe expanded, the energy and radiation within it became stretched out and thinned, resulting in a decrease in temperature.
Scientists have observed that the temperature of the universe has cooled as they study the cosmic microwave background radiation (CMBR). CMBR is a faint uniform glow that fills the entire sky and can be detected in microwave wavelengths. This radiation is "relic radiation" from the early universe, emitted only 380,000 years after the Big Bang.
The CMBR has been measured and found to have a temperature of about 2.7 Kelvin or -270.3 degrees Celsius. This temperature is significantly lower than what would be expected if the universe was still in a highly energetic state. It serves as strong evidence for the expansion and cooling of the universe since the Big Bang.
Therefore, the correct answer is: "The temperature of the universe has cooled over time."