Why were early detection methods most sensitive to large planets orbiting closely?

Answer

Large, close planets cause the largest, most easily detectable wobble in their stars or the deepest, most frequent dips in starlight.

The primary methods used initially, like the transit method or radial velocity method, are biased toward detecting larger planets that produce more significant, easily measurable signals (starlight dips or stellar wobbles).

Why were early detection methods most sensitive to large planets orbiting closely?
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