How would astronomers use spectra A, B and C to precisely calculate how fast the star...

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Physics

How would astronomers use spectra A, B and C to preciselycalculate how fast the star was moving? How would the speed thestar is moving allow astronomers to be able to deduce informationabout the orbiting planet? What type of information could theastronomers calculate?

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Ans A star with a planet will move in its own small orbit in response to the planets gravity This leads to variations in the speed with which the star moves toward or away from Earth ie the variations are in the radial velocity of the star with respect to Earth The planet    See Answer
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