Why do many galaxies that are gravitationally lensed by galaxy clusters look like arcs of a circle?
A) Arc-like galaxies are more likely to be lensed.
B) asymmetries in the cluster
C) They are close behind the cluster.
D) They are the most luminous galaxies behind the cluster.

Question

Quizplus · Accepted Answer

Gravitational lensing by galaxy clusters can create arc-like images of galaxies due to the asymmetries in the mass distribution of the cluster. This uneven distribution of mass bends the light from galaxies behind the cluster in such a way that their images are stretched into arcs around the cluster.

Why Do Many Galaxies That Are Gravitationally Lensed by Galaxy