Detecting a planet around another star using the transit method is difficult because the
A) planet must pass directly in front of the star.
B) planet must have a rocky composition.
C) star must be very dim.
D) star must be moving with respect to us.
E) planet's orbital period is usually longer than 1 month.

Question

Quizplus · Accepted Answer

The transit method requires the planet to pass directly in front of the star from our point of view, causing a slight dimming of the star's light, which is difficult to detect.

Detecting a Planet Around Another Star Using the Transit Method