Galaxies that are classified as quasars were much more numerous in the past.

Question

Quizplus · Accepted Answer

This is true because quasars are powered by supermassive black holes that actively accrete gas and dust. In the early universe, there were more galaxies with higher rates of star formation and more gas and dust available for black hole accretion, leading to a higher number of quasars. As the universe has aged and galaxies have evolved, the number of quasars has decreased.

Galaxies That Are Classified as Quasars Were Much More Numerous