Question

____ is the detection of halo objects like brown dwarfs when their gravitational fields concentrate the light of distant sources (like galaxies).

Answer 1

Microlensing.

Step-by-step explanation:

This techniques is called Microlensing.

Microlensing is a method of gravitational lensing where light from a backdrop point of origin is curved to develop distorted, numerous and/or lightened images by the gravity field of a foreground lens.

This method is very effective in discovering planets that are far-far from earth.It is actually an astronomical effect that was predicted by Albert Einstein's general theory of relativity.