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

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

To Determine Whether a Celestial Body Is Approaching or Receding