Question

What do astronomers use too calculate the age of the universe?check all dat apply?

-Dark energy

-The age of rocks on earth

-The age of the oldest stars

-patterns of background radiation

-How fast distant galaxies can are moving away from us

Answer 1

The answer is, How fast distant galaxies are moving away from us

Answer 2

Option C, The age of the oldest stars

Option E How fast distant galaxies can are moving away from us

Step-by-step 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=
`(2)/(3H_(0))`

where ,
`H_(0) =` Hubble's constant

Hence, Both option C and E are correct