Final answer:
The transit method is most effective for big planets in edge-on orbits around small stars, as these conditions create a more detectable dip in the star's brightness, indicating a planet's presence and size.
Step-by-step explanation:
The transit method of planet detection is an indirect observational technique that involves monitoring the brightness of stars to detect possible planets transiting in front of them. The method works best for big planets in edge-on orbits around small stars because their transits result in a more noticeable dimming of the star's light.
Such configurations facilitate the observation of a periodic dip in the star's brightness, which indicates the presence and size of the planet. Additionally, detecting multiple planets within the same star system or combining transit data with Doppler shift measurements can provide further confirmation of planetary presence and characteristics.