To determine whether a celestial body is approaching or receding from Earth,astronomers employ ________.
A)the Stefan-Boltzmann law
B)Einstein's equation
C)the Doppler principle
D)high speed radar
E)telescopic imaging

Name: To determine whether a celestial body is approaching or receding from Earth,astronomers employ ________. A)the Stefan-Boltzmann law B)Einstein's equation C)the Doppler principle D)high speed radar E)telescopic imaging
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The Answer is C

To Determine Whether a Celestial Body Is Approaching or Receding