How have astronomers searched for evidence of MACHOs in the halo of the Milky Way?
A) They search for stars that are binary companions of MACHOs.
B) They search for rapidly moving massive gas clouds.
C) They search for disturbances in the background of gravitational waves.
D) They search for distant stars with light briefly amplified by gravitational lensing.
E) They search for close binary stars undergoing mass transfer.

Question

Quizplus · Accepted Answer

Astronomers search for MACHOs (Massive Compact Halo Objects) by looking for gravitational lensing events, where the light from distant stars is briefly amplified as a MACHO passes in front of them. This method is known as microlensing.

How Have Astronomers Searched for Evidence of MACHOs in the Halo