itsjustbethiedu itsjustbethiedu

28-05-2018
Chemistry

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How do scientists know that the universe is expanding? Question 2 options: a) The Doppler effect shows stars with red shifted light. b) The Doppler effect shows stars with blue shifted light. c)The Doppler effect shows stars with green shifted light. d)The Doppler effect shows stars with yellow shifted light.

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carolbulbul carolbulbul

29-05-2018

The answer is A, which is often known as the red shift. It is the displacement of spectral lines toward longer wavelengths.

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