Question

How do quasars differ from galaxies?

Answer 1

A quasar is the center of a far distant galaxy, that has an extremely bright center.

Explanation:

Perhaps, a quasar is the Black Hole of a galaxy, from which light

might break out, from the edges.

Perhaps, the circular glow, with several-light years-wide dark region

across, from that great distance, is viewed as a a point source of

very bright light..

The energy emitted by a quasar might exceed the total of energies

of all stars of the galaxy of which the quasar is a point source of

extreme radiation, at the center.

Reference: www.space.com/16172-quasar-definition.html