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
11%
2%
23%
61%
34
flagRomania
6%
0%
33%
60%
15
flagLebanon
6%
0%
40%
53%
15
flagUnknown
2%
0%
47%
50%
36
flagFrance
0%
3%
46%
50%
26
flagthe United States
12%
3%
39%
44%
524
flagthe Philippines
24%
4%
28%
44%
50
flagAustralia
15%
3%
36%
43%
65
flagGreece
0%
4%
52%
43%
23
flagCanada
17%
6%
31%
42%
47
flagthe Netherlands
10%
0%
47%
42%
19
flagMalaysia
17%
0%
41%
41%
17
flagthe United Kingdom
10%
4%
45%
39%
199
flagSwitzerland
13%
0%
50%
36%
30
flagAustria
10%
1%
52%
35%
76
flagIndia
20%
4%
39%
34%
606
flagPoland
8%
4%
53%
33%
12152
flagSouth Africa
13%
0%
46%
33%
15
flagGermany
14%
3%
48%
32%
449
flagRepublic of Ireland
0%
6%
75%
18%
16