The term quasar is written in different ways. Referred to as quasar, it refers to the original English term. It can also be indicated as a quasar or even as a quasar, in accordance with the changes that the Royal Spanish Academy (RAE) accepted in recent years so that words that begin with Q begin to be written with C.

They bear that name because they are point objects like stars. However, they are not stars. Various analyzes have determined that they are very far away, some being the most distant objects we can see. They are also very bright.

These quasars are phenomena that occur when a huge black hole, located in the core of a galaxy, begins to absorb all the matter that is in its vicinity. In optical telescopes, most quasars look like simple points of light, although some appear to be the centers of active galaxies.

Small in size, quasars stand out for the emission of radiation at all frequencies and for their great luminosity. This allows that, despite the enormous distance that separates the quasars from our planet, they are visible.

Usually most quasars are too far away to be seen by small telescopes, however 3C 273 has an apparent magnitude of 12.9 and is an exception.

In 1978 it was observed that one of them, an intense X-ray source, had a very bright nucleus that turned out to be a quasar located about 250 Megaparsecs away. Similar findings led astronomers Balick and Heckman to state that some fuzzy regions around some quasars have the structure, size, and brightness of large stellar groups, where they concluded that “it seems plausible that certain quasars are active nuclei of galaxies.”

The interpretation of quasars with very remote objects seems to explain their large Doppler shift, sometimes 90% of the speed of light. If they were as far away as inferred from this data (hundreds of Mpc), their luminosity would have to be enormous to still be visible. The optical luminosity and radio wave data are tens of times higher than normal galaxies.