Answer:
Option C, The age of the oldest stars
Option E How fast distant galaxies can are moving away from us
Explanation:
As per the Big bang theory, all the celestial objects be it star or planet originated at the initial stage of formation of universe. Thus, If the age of the oldest star is known , then the age of the universe can also be determined.
The age of universe can also be determined by working out the Hubble's constant which is nothing but the current expansion rate of universe.
Once the Hubble's constant is worked out, the age of universe can be calculated by following mathematical relation
Age of Universe= [tex]\frac{2}{3H_{0}}[/tex]
where , [tex]H_{0} =[/tex] Hubble's constant
Hence, Both option C and E are correct
