Detecting a planet around another star using the transit method is difficult because
A) the planet must pass directly in front of the star.
B) the planet must have a rocky composition.
C) the star must be very dim.
D) the star must be moving with respect to us.

Question

Quizplus · Accepted Answer

The transit method involves observing a decrease in the brightness of a star as a planet passes directly in front of it, which is a rare and precise alignment. Therefore, detecting a planet using the transit method is difficult because the planet must pass directly in front of the star.

Detecting a Planet Around Another Star Using the Transit Method