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Which of the following is used to determine if a star is moving closer to Earth?

Absolute magnitude
Brightness
Doppler shift
Parallax

I was debating between C and D but think it is D.

Answer :

This is Doppler Shift (C).  As the emitting object moves closer to an observer, the waves shift to a higher frequency called a blue shift.  Moves away called a red shift (lowering of the frequency)

Answer:

Doppler shift

Explanation:

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