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A. Doppler effect in which an object appears bluer when it is moving towards the observer or observer is moving towards the object.
B. Turning a star from white to blue
C. In future sun would become blue
D. Black hole was blue at its start
E. None of these

Correct Answer: Doppler effect in which an object appears bluer when it is moving towards the observer or observer is moving towards the object.

Last Updated: August 13, 2016