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%
48%
48%
27
flagthe United States
12%
3%
38%
46%
575
flagGreece
0%
4%
50%
45%
24
flagCanada
16%
6%
32%
44%
50
flagAustralia
14%
2%
37%
43%
69
flagthe Philippines
22%
3%
30%
43%
53
flagthe Netherlands
9%
0%
47%
42%
21
flagMalaysia
17%
0%
41%
41%
17
flagthe United Kingdom
9%
4%
48%
37%
221
flagIndia
20%
4%
39%
35%
640
flagAustria
8%
1%
54%
35%
90
flagPoland
8%
4%
53%
33%
12851
flagGermany
16%
3%
46%
33%
622
flagSwitzerland
10%
5%
51%
33%
39
flagSouth Africa
15%
0%
52%
26%
19
flagRepublic of Ireland
0%
10%
75%
15%
20