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
flagUnknown
2%
0%
47%
50%
36
flagAustralia
12%
3%
35%
48%
54
flagAustria
8%
0%
43%
48%
37
flagCanada
14%
4%
30%
47%
42
flagGreece
0%
4%
50%
45%
22
flagthe United States
12%
3%
40%
43%
469
flagthe Philippines
26%
4%
26%
42%
45
flagFrance
0%
4%
52%
42%
21
flagthe Netherlands
15%
0%
46%
38%
13
flagthe United Kingdom
10%
4%
46%
37%
173
flagMalaysia
18%
0%
43%
37%
16
flagIndia
18%
4%
40%
35%
484
flagSwitzerland
7%
0%
57%
35%
14
flagPoland
8%
4%
54%
32%
11215
flagGermany
13%
4%
49%
32%
191
flagSouth Africa
15%
0%
46%
30%
13
flagthe United Arab Emirates
7%
7%
46%
30%
13
flagRepublic of Ireland
0%
9%
72%
18%
11