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
flagLebanon
6%
0%
37%
56%
16
flagUnknown
2%
0%
47%
50%
36
flagFrance
0%
3%
46%
50%
26
flagGreece
0%
4%
50%
45%
24
flagthe United States
12%
3%
39%
44%
532
flagAustralia
14%
2%
36%
44%
68
flagthe Philippines
23%
3%
28%
44%
52
flagCanada
16%
6%
32%
44%
50
flagthe Netherlands
10%
0%
47%
42%
19
flagMalaysia
17%
0%
41%
41%
17
flagthe United Arab Emirates
6%
6%
40%
40%
15
flagthe United Kingdom
9%
4%
46%
38%
207
flagAustria
9%
1%
54%
35%
85
flagSwitzerland
11%
0%
52%
35%
34
flagIndia
21%
4%
39%
34%
627
flagPoland
8%
4%
53%
33%
12420
flagGermany
14%
3%
48%
32%
529
flagSouth Africa
11%
0%
52%
29%
17
flagRepublic of Ireland
0%
5%
78%
15%
19