Quasars are the most intense sources of light in the Universe. Although no bigger than the Solar System, they glow with the brightness of 100 galaxies.
Quasars are the most distant known objects in the Universe. Even the nearest is billions of light-years away.
The most distant quasar is on the very edges of the known Universe, 12 billion light-years away.
Some quasars are so far away that we see them as they were when the Universe was still in its infancy — 20 percent of its current age.
Quasar is short for Quasi-Stellar (star-like) Radio Object. This comes from the fact that the first quasars were detected by the strong radio signals they give out and also because quasars are so small and bright that at first people thought they looked like stars.
Only one of the 200 quasars now known actually beams out radio signals, so the term Quasi-Stellar Radio Object is in fact misleading!
The brightest quasar is 3C 273, two billion light-years away.
Quasars are at the heart of galaxies called ‘active galaxies’.
Quasars may get their energy from a black hole at their core, which draws in matter
The black hole in a quasar may pull in matter ferociously.
The Hubble space telescope’s clear view of space has given the best-ever with the same mass as 100 million Suns.