Final answer:
Large redshifts in a quasar's spectrum indicate that quasars are moving away from us at high speeds, are extremely distant, and are incredibly luminous, releasing vast amounts of energy.
Step-by-step explanation:
The question about the large redshift seen in a quasar's spectrum touches upon an essential aspect of astrophysics. Most astronomers interpret this redshift as an indication that the quasar is moving away from us at a significant velocity. This redshift provides evidence that the universe is expanding, following the Hubble law, which posits a relationship between the distance of an object and its recessional velocity. Since quasars show such large redshifts, often ranging from 15% to more than 96% the speed of light, they must be at vast distances. Additionally, given that quasars must be extremely luminous to be seen over such distances—10 to 100 times more luminous than brighter normal galaxies—it indicates that they release a tremendous amount of energy in a relatively small volume, sometimes no larger than our solar system.