Question

A scientist estimates that there are about 10²⁴ stars in the universe in that each galaxy has on average approximately the same number of stars in the Milky Way galaxy. How many galaxies are there in the universe write your answer as a power?

Answer 1

Since the Milky Way galaxy has 10x10^10 stars, we have that:

`10x10^(10)=10^(11)`

Now we divide the number of stars in the universe by 10^11:

`(10^(24))/(10^(11))=10^(24-11)=10^(13)`

therefore, there are about 10^13 galaxies in the universe