Question

The temperature of the universe is now about 2.73 K. How will the temperature of the universe be different a billion years in the future?

a) It will remain at 2.73 K
b) It will decrease significantly
c) It will increase significantly
d) It's impossible to predict the temperature a billion years in the future.

Answer 1

According to the standard model of the Big Bang, the temperature of the universe decreases over time. Therefore, in a billion years, the temperature of the universe is expected to decrease significantly.

Step-by-step explanation:

The temperature of the universe is expected to decrease as the universe continues to expand. Drawing from the principle that the universe cools as it expands, which has been observed since shortly after the Big Bang, we can predict that a billion years in the future, the temperature will likely be lower than it is today. According to the standard model of the Big Bang, the temperature of the universe dropped from unimaginably hot to 3000 K over the course of a few hundred thousand years and has continued to cool since. Thus, it's reasonable to infer that in a billion years, the temperature will have decreased significantly, answering the original question with option (b).

Answer 2

The temperature of the universe is now about 2.73 K, then the temperature of the universe, It will decrease significantly

The answer is option ⇒B

Step-by-step explanation:

In the context of our current understanding of the universe, the temperature of the universe will be different a billion years in the future.

The universe is currently experiencing a process known as cosmic expansion, where galaxies and other cosmic structures are moving away from each other. As the universe expands, the wavelength of light from distant objects stretches, resulting in a phenomenon called cosmological redshift. This redshift causes the temperature of the radiation left over from the Big Bang, known as the cosmic microwave background (CMB), to decrease over time.

Therefore, a billion years in the future, the temperature of the universe is expected to be lower than the current temperature of 2.73 K. The exact temperature change will depend on various factors, such as the rate of cosmic expansion and the influence of other cosmic phenomena, but it is generally believed that the temperature will decrease.

So, the correct answer is b) It will decrease significantly.