From the cosmic background radiation, what can scientists infer that the universe was like after the big bang ?

a) very small
b) hot
c) the same average temperature as it is today
d) cooler then it is today

Yes I did read it out days that it is cooler. It has different pictures. Are you here on this site to bully people? I asked for help and I get yelled at. Thanks for everything.

A very hot

To infer what the universe was like after the Big Bang from the cosmic background radiation, scientists look for specific characteristics in the radiation. The cosmic background radiation is the residual heat left over from the early stages of the universe, when it transitioned from being dense and hot to becoming transparent.

From studying the cosmic background radiation, scientists have made several inferences about the early universe:

1. **Hot**: The cosmic background radiation is evidence that the early universe was extremely hot. It is currently observed to have an average temperature of around 2.7 Kelvin (-270.45 degrees Celsius or -454.81 degrees Fahrenheit).

2. **Very small**: The distribution and pattern of the cosmic background radiation indicate that the early universe was much smaller than it is today. The radiation is scattered uniformly throughout the universe, suggesting that at one point, everything was much closer together.

3. **Cooler than it is today**: While the early universe was incredibly hot, it has since cooled down significantly. The cooling can be seen in the lower temperature of the cosmic background radiation. As the universe expanded, the radiation stretched out and cooled down.

Based on these inferences, we can conclude that the correct answers are b) hot and d) cooler than it is today.