What are the most luminous objects in the universe?

supergiant stars
novae
supernovae
quasars
A quasar is an extremely energetic source of radiation powered by accretion disc around galaxy's central supermassive black hole. Quasars were much more common in the early universe, as all known quasars are extremely distant.
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Answers by country

supergiant stars
novae
supernovae
quasars
answers
flagRomania
7%
0%
23%
69%
13
flagPakistan
13%
3%
20%
63%
30
flagAustralia
14%
4%
29%
51%
47
flagUnknown
2%
0%
47%
50%
36
flagAustria
9%
0%
42%
48%
33
flagCanada
12%
5%
32%
47%
40
flagGreece
0%
4%
50%
45%
22
flagthe Philippines
26%
4%
26%
42%
45
flagthe United States
13%
4%
41%
41%
448
flagFrance
0%
5%
55%
40%
20
flagthe United Kingdom
9%
4%
45%
39%
153
flagSwitzerland
7%
0%
53%
38%
13
flagMalaysia
18%
0%
43%
37%
16
flagIndia
18%
4%
40%
36%
461
flagGermany
15%
2%
47%
34%
163
flagthe Netherlands
16%
0%
50%
33%
12
flagPoland
8%
4%
54%
32%
10993
flagthe United Arab Emirates
7%
7%
46%
30%
13
flagSouth Africa
15%
0%
46%
30%
13
flagRepublic of Ireland
0%
10%
70%
20%
10