Gravitational lensing of distant, faint irregular galaxies may be the key to
A) determining galactic redshifts.
B) quasar energy production.
C) mapping dark matter.
D) understanding active galactic nuclei.
E) understanding galactic rotation curves.

Question

Quizplus · Accepted Answer

Gravitational lensing, the bending of light from distant objects by massive foreground objects, is a powerful tool for mapping the distribution of dark matter. This is because the lensing effect is caused by the gravitational field of the mass between the source and the observer, including both visible and dark matter.

Gravitational Lensing of Distant, Faint Irregular Galaxies May Be the Key