First called a
“quasi-stellar radio source” (QSS), the quasar was discovered in
the 1960s. Astronomers had picked up radio waves from space and
used their telescopes to determine what the source could be.
They found a few possibilities: a supernova remnant, the birth
of new star(s), etc.
There was also emptiness. In these spots, all astronomers could
find was an illumination – point-like, similar to stars.
As it turned out, this was a quasar: the center of a distant
galaxy found on the edge of this universe. Studies have since
discerned that in the center of this far-off galaxy, there’s a
lot of action happening whereby massive amounts of energy are
source of this energy output is likely a supermassive black
hole. Modern astronomers theorize that quasars are a type of
“active galactic nuclei” or AGN.