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
flagPakistan
13%
3%
20%
63%
30
flagRomania
6%
0%
33%
60%
15
flagUnknown
2%
0%
47%
50%
36
flagAustralia
12%
3%
35%
46%
56
flagCanada
13%
6%
30%
46%
43
flagAustria
7%
0%
47%
45%
40
flagFrance
0%
4%
50%
45%
24
flagthe United States
12%
3%
40%
43%
482
flagthe Philippines
26%
4%
26%
43%
46
flagGreece
0%
4%
52%
43%
23
flagthe United Kingdom
10%
4%
44%
39%
182
flagSwitzerland
5%
0%
55%
38%
18
flagMalaysia
18%
0%
43%
37%
16
flagIndia
19%
4%
40%
36%
525
flagthe United Arab Emirates
7%
7%
42%
35%
14
flagthe Netherlands
13%
0%
53%
33%
15
flagPoland
8%
4%
54%
32%
11476
flagGermany
14%
5%
49%
31%
236
flagSouth Africa
14%
0%
50%
28%
14
flagRepublic of Ireland
0%
7%
76%
15%
13