What phenomenon allows astronomers to detect the star's 'wobble' using the radial velocity method?
Answer
The Doppler effect causing spectral shifts (redshift/blueshift)
The radial velocity method detects the gravitational tug by observing how the star's light shifts minutely—towards blue when moving toward Earth (blueshift) and towards red when moving away (redshift), which is governed by the Doppler effect.
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