Question

Based on counting the number of galaxies in a small patch of the sky and multiplying by the number of such patches needed to cover the entire sky, the total number of galaxies in the observable universe is estimated to be approximately

A) 100 million.
B) 100 billion.
C) 1 billion.
D) 1 trillion.
E) 10 billion.

Answer 1

100 billion

Explanation:

Some astronauts reveals that there are 100 billion galaxies in the universe.