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
5%
0%
35%
58%
17
flagRomania
5%
0%
35%
58%
17
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%
544
flagAustralia
14%
2%
36%
44%
68
flagCanada
16%
6%
32%
44%
50
flagthe Philippines
22%
3%
30%
43%
53
flagthe Netherlands
10%
0%
47%
42%
19
flagMalaysia
17%
0%
41%
41%
17
flagthe United Kingdom
9%
4%
47%
38%
212
flagIndia
20%
4%
39%
35%
637
flagAustria
8%
1%
54%
35%
90
flagPoland
8%
4%
53%
33%
12633
flagGermany
15%
3%
48%
32%
572
flagSwitzerland
10%
5%
51%
32%
37
flagSouth Africa
11%
0%
52%
29%
17
flagRepublic of Ireland
0%
5%
78%
15%
19