The Doppler method can find exoplanets only if their orbital plane is "edge-on" as viewed from Earth.

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Quizplus · Accepted Answer

The Doppler method, or radial velocity method, can detect exoplanets by measuring the star's motion towards and away from us, which does not require the orbital plane to be "edge-on". It can detect planets regardless of the orientation of their orbits, although the sensitivity varies with the inclination of the orbit.

The Doppler Method Can Find Exoplanets Only If Their Orbital