How does the change in the temperature of the universe provide evidence for universe expansion that supports the big bang theory?
The universe is warming 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 to happen as the universe expands
The correct statement is that the universe is cooling, which supports the big bang theory and the idea of universe expansion. According to the theory, the universe began as an extremely hot and dense state, and as it expanded, it also cooled down. This cooling can be observed through the measurement of the cosmic microwave background radiation (CMB), which is essentially the residual heat left over from the early stages of the universe. The CMB temperature is currently measured to be around 2.7 Kelvin, which aligns with the prediction of a cooling universe as it expands. This observed cooling of the universe provides evidence that supports the big bang theory and the concept of an expanding universe.
The change in the temperature of the universe provides evidence for universe expansion that supports the Big Bang theory in two ways:
1. The universe is warming: According to the Big Bang theory, as the universe expands, the space between galaxies also expands. This expansion causes the wavelength of light to stretch, resulting in a decrease in its energy and an increase in its wavelength, which corresponds to a decrease in temperature. However, it is important to note that when astronomers refer to the warming of the universe, they mean that the average temperature between galaxies is warming, not that individual objects are becoming hotter.
2. The universe is cooling: As the universe expands, the density of matter and energy decreases. This decrease in density leads to a cooling effect over time. The Big Bang theory predicts that the initial state of the universe was extremely hot and dense, but as the universe expanded, it cooled down. Observations of the Cosmic Microwave Background (CMB) radiation, which is the afterglow of the Big Bang, provide strong evidence for the cooling of the universe. The CMB radiation has been measured and found to have a temperature of approximately 2.73 degrees Kelvin, which aligns with predictions made by the Big Bang theory.
In summary, the observed changes in the temperature of the universe, both the warming of the average temperature between galaxies and the overall cooling of the universe, are consistent with the predictions of the Big Bang theory, providing evidence for the expansion of the universe.
The change in the temperature of the universe provides evidence to support the Big Bang theory by following the principle of cosmic microwave background radiation. According to this theory, the universe originated from a highly dense and hot state, known as the Big Bang, and has been expanding ever since.
As the universe expanded, it gradually cooled down. This cooling process has led to a decrease in the average temperature of the universe. This decline in temperature is observable through the detection of cosmic microwave background radiation (CMBR).
CMBR is a faint radiation that permeates throughout the universe and is considered a remnant of the Big Bang. It was first discovered in 1965 by Arno Penzias and Robert Wilson. The CMBR has a specific temperature known as the cosmic microwave background temperature, which today is measured to be approximately 2.7 Kelvin (-270.45 degrees Celsius or -454.81 degrees Fahrenheit).
The fact that we measure this background temperature provides evidence for the expansion of the universe. According to the Big Bang theory, as the universe expands, the wavelengths of photons within it also stretch (known as redshift), causing them to lose energy and cool down. This cooling results in a decrease in the temperature of the universe. By detecting and measuring the CMBR, scientists can confirm that the universe is indeed cooling, consistent with the predictions of the Big Bang theory.
It's important to note that while the overall temperature of the universe is cooling, there can still be local variations in temperature due to various astrophysical processes.