Author Question: Seeds around which galaxies, clusters and walls grew may have been ___________ before inflation and ... (Read 50 times)

Destiiny22 · **on:** Jul 27, 2018

Seeds around which galaxies, clusters and walls grew may have been ___________ before inflation and recombination.

a. caused by hot dark matter
b. caused by baryons
c. the result of the separation of the electromagnetic and weak forces
d. the result of freezing water molecules shortly after the Universe became transparent to photons
e. caused by initially tiny quantum mechanical fluctuations in space-time

Question 2

Explain how we can find the age of a star cluster.

What will be an ideal response?

debra928 · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

e

Answer to Question 2

We can judge the age of a star cluster by looking at the turnoff point, the point on the main sequence where stars are currently evolving to the right to become giants. Stars at the turnoff point have lived out their lives and are about to die. Consequently, the life expectancy of the stars at the turnoff point equals the age of the cluster.