Which is evidence of universe expansion that supports the Big Bang Theory?(1 point)
Responses
The temperature of the universe has warmed over time.
The temperature of the universe has warmed over time.
The temperature of the universe has cooled over time.
The temperature of the universe has cooled over time.
The temperature of the universe has cooled and warmed repeatedly over time.
The temperature of the universe has cooled and warmed repeatedly 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 over time.
The correct answer is:
- The temperature of the universe has cooled over time.
The cooling of the universe's temperature is a significant piece of evidence supporting the Big Bang Theory. According to the theory, the universe started as an extremely hot and dense state, and as it expanded, it cooled down. This cooling is observed and measured by scientists, providing strong evidence for the Big Bang Theory.
The correct answer is "The temperature of the universe has cooled over time." This is evidence of the expansion of the universe and supports the Big Bang Theory.
To understand why, let's break it down:
1. The Big Bang Theory proposes that the universe originated from a singularity and has been expanding ever since. As the universe expands, it also cools down over time.
2. One of the most compelling lines of evidence for the Big Bang Theory is the observation of cosmic microwave background radiation (CMB). This is residual heat from the early stages of the universe, which was released when the universe had cooled down enough for atoms to form. The CMB is detected as a faint, uniform microwave radiation coming from all directions in the sky.
3. The detection and mapping of the CMB have shown that it has a nearly uniform temperature of about 2.7 Kelvin (-270.45 degrees Celsius or -454.81 degrees Fahrenheit) in all directions. This means that the universe has cooled down from extremely high temperatures at the time of the Big Bang to its current temperature.
Therefore, the fact that the temperature of the universe has cooled over time is a strong piece of evidence supporting the Big Bang Theory and the expansion of the universe.