Chapter 34, Problem 3TE

To determine

The effect on the darkness of clear night sky.

Answer to Problem 3TE

If the universe were unchanged with time, then the stars cover up the night sky and bright like the Sun.

Explanation of Solution

According to the Olbers paradox, if the universe were same, unchanged with time and infinite, then stars would cover the night sky. The night sky will be bright like the Sun.

The universe is constantly increasing in its size, so this theory did not give the significance of darkness in the night sky. Later, scientists give the concept of a finite universe and finite age of the universe, it explains the reason for darkness in the night sky.

The universe was born 15 billion years ago in an explosion called a big bang theory. From starting to its present, it is continuously expanding. Because of these stars and galaxy getting far away from each other.

Conclusion:

Therefore, if the universe were unchanged with time, then the stars cover up the night sky and bright like the Sun.