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Home Q & A Board Science-Related Homework Help Geography and Earth Sciences
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apich apich
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6 years ago
To determine whether a celestial body is approaching or receding from Earth, astronomers employ ________.
 
  A) Einstein's equation
  B) the Stefan-Boltzmann law
  C) the Doppler principle
  D) telescopic imaging
  E) high speed radar
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saundrasmith243saundrasmith243
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6 years ago
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4 years ago
Thanks
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