Question

Which of the following is used to quantify the rate of universal expansion or contraction?
A. Hubble's constant
B. Cephid variables
C. Cosmic microwave background radiation
D. Gravitational microlensing

Answer 1

Answer:

A. Hubble's Constant

Explanation:

Hubble stated that the universe keeps on expanding because it has many galxais and each day 1 new galaxy is formed .

Answer 2

Hubble's constant is used to quantify the rate of Universal expansion or contraction.

Option a

Explanation:

• Hubble in his experiment say that the entire universe is subjected to expansion or contraction very frequently.

• This results in the change in the gravitational force in the universe. she also stated that every moment a new Galaxy is being created and as a result of this there is more of the expansion of the universe and the contraction of the universe which results in the destruction of the gravitational forces.

To know more about hubble's constant,

Explain the hubble's law

https://brainly.in/question/148077