Question

Which of the following indicates that the universe is expanding?

Question 21 options:

The spectra of Cepheid variables, which are found only in our galaxy, are red shifted.


The spectra of Cepheid variables, which are found in all galaxies, are red shifted.


HELP!!! The spectra of Cepheid variables, which are found only in our galaxy, are blue shifted.


The spectra of Cepheid variables, which are found in all galaxies, are blue shifted.

Answer 1

Answer:

the second one

Explanation:

The spectra of Cepheid variables, which are found in all galaxies, are red shifted.

Answer 2

The correct option is the second one i.e. the spectra of Cepheid variables that are only in our galaxy are red-shifted.

Cepheid variable

The type of star which pulsates radially and varies in diameter and temperature is known as the Cepheid variable.

Now, the Cepheid variables are used to measure long distances from which we can indicate the diameter of the universe or we can say the length of the universe through its shifting.

Therefore, the expansion of the universe is indicated by the Cepheid variable which means that option second is correct.

Learn more about The Cepheid variable here-https://brainly.com/question/16793312

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