10 Questions
What factors influence the observed properties of a quasar?
The presence or absence of a jet
When was the term 'quasar' first introduced?
In 1964 by Hong-Yee Chiu
How old was the universe when light from quasar ULAS J1342+0928 was emitted?
690 million years old
What is a large group of multiple quasars known as?
Large quasar group
When did astronomers first realize that some objects seen were distant galaxies like the Milky Way?
Between 1917 and 1922
What powers the emission from an active galactic nucleus (AGN) in a quasar?
Supermassive black hole
How do quasars compare in luminosity to a galaxy like the Milky Way?
Thousands of times more luminous
Why are quasars usually categorized as a subclass of the more general category of AGN?
As they have supermassive black holes at their centers
What is the cosmological origin of the redshifts observed in quasars?
Expansion of the universe
What did the term 'quasar' originate as a contraction of?
'Quasi-stellar [star-like] radio source'
Test your knowledge about quasars, extremely luminous active galactic nuclei powered by supermassive black holes. Learn more about their emission, accretion discs, and radiant energy.
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