Briefly explain how we can use spectral lines to determine an object's radial motion (toward or away from us). Can we also learn the object's tangential motion (across our line of sight)from its spectral lines?

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The Answer of Briefly explain how we can use spectral lines to determine an object's radial motion (toward or away from us). Can we also learn the object's tangential motion (across our line of sight)from its spectral lines?

Briefly Explain How We Can Use Spectral Lines to Determine