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%
28%
64%
14
flagPakistan
13%
3%
20%
63%
30
flagUnknown
2%
0%
47%
50%
36
flagCanada
14%
4%
30%
47%
42
flagAustralia
12%
3%
35%
46%
56
flagAustria
7%
0%
46%
46%
39
flagGreece
0%
4%
50%
45%
22
flagFrance
0%
4%
50%
45%
22
flagthe United States
12%
3%
40%
43%
472
flagthe Philippines
26%
4%
26%
43%
46
flagthe United Kingdom
10%
4%
45%
37%
175
flagMalaysia
18%
0%
43%
37%
16
flagSwitzerland
6%
0%
56%
37%
16
flagIndia
18%
4%
40%
36%
501
flagthe Netherlands
14%
0%
50%
35%
14
flagPoland
8%
4%
54%
32%
11301
flagGermany
12%
4%
50%
32%
208
flagthe United Arab Emirates
7%
7%
46%
30%
13
flagSouth Africa
14%
0%
50%
28%
14
flagRepublic of Ireland
0%
9%
72%
18%
11