Quasars and blazars are powered by the gravitational accretion of matter onto a supermassive black hole at the center of a galaxy.

Quasars and blazars are extremely compact objects, with sizes typically smaller than our own solar system.

Blazars are a subclass of quasars that have a powerful jet of particles and radiation pointed towards Earth, making them appear brighter and more variable.

Quasars are extremely luminous objects, emitting more energy than an entire galaxy.

The most distant quasar observed to date has a redshift of z = 13.0, meaning its light has been traveling for over 13 billion years.

Quasars and blazars play a significant role in galaxy evolution by triggering star formation, quenching star formation, and regulating the growth of supermassive black holes.

The typical lifetime of a quasar is on the order of hundreds of millions of years.

The first quasar discovered was 3C 273, located in the constellation Virgo.

The supermassive black holes at the center of quasars typically have masses ranging from hundreds of millions to billions of solar masses.

The jets in blazars can travel at speeds very close to the speed of light.

Quasars are typically located billions of light-years away from Earth.

OJ 287 is the closest known quasar to Earth, located about 1.2 billion light-years away.

Blazars are highly variable objects, with their brightness changing on timescales of days to weeks.

SDSS J1148+5251 is the largest quasar ever discovered, with a diameter of about 1.4 million light-years.

S5 0716+714 is the most powerful blazar ever discovered, with a luminosity of about 10^49 erg/s.