Which method relies on the mass of a dark object revealing its presence?

Question

Quizplus · Accepted Answer

The method that relies on the mass of a dark object revealing its presence is the temporary brightening of a distant star by a gravity lens. When a massive object passes between a distant star and an observer, its gravity acts as a lens, bending and magnifying the light of the star. This causes a temporary brightening of the star, revealing the presence of the massive object. By observing the duration and intensity of the brightening, scientists can calculate the mass and distance of the object causing the lensing.

Which Method Relies on the Mass of a Dark Object