Two Neutron Stars Form a Close Binary System and Orbit

Two neutron stars form a close binary system and orbit each other rapidly. If we watch this motion from a position in the plane of the binary orbits, we would expect to see evidence of:

A) both a Doppler shift and a gravitational redshift.
B) a Doppler shift but not a gravitational redshift.
C) a gravitational redshift but not a Doppler shift.
D) neither a Doppler shift nor a gravitational redshift.

Correct Answer:

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