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

Romania

23%

69%

Pakistan

13%

20%

63%

Australia

14%

29%

51%

Unknown

47%

50%

Austria

42%

48%

Canada

12%

32%

47%

Greece

50%

45%

the Philippines

26%

42%

the United States

13%

41%

448

France

55%

40%

the United Kingdom

45%

39%

153

Switzerland

53%

38%

Malaysia

18%

43%

37%

India

18%

40%

36%

461

Germany

15%

47%

34%

163

the Netherlands

16%

50%

33%

Poland

54%

32%

10993

the United Arab Emirates

46%

30%

South Africa

15%

46%

30%

Republic of Ireland

10%

70%

20%

What is the source of the most powerful release of energy in the universe, second in scale only to the Big Bang?

What was the most beautiful comet of the second half of the twentieth century, with two tails visible to the naked eye?

Halley's comet

Comet McNaught

Comet Hale-Bopp

There was no such comet

The Drake equation is used to...

estimate the number of extraterrestrial civilizations in the Milky Way galaxy

estimate the age of the universe and the number of existing galaxies

estimate the number of died stars

making computing connected with gravity and weightlessness

Which continent has the lowest precipitation rate?