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

Pakistan

11%

23%

61%

Lebanon

35%

58%

Romania

35%

58%

Unknown

47%

50%

France

48%

the United States

11%

38%

46%

580

Greece

50%

45%

Canada

16%

32%

44%

Australia

14%

37%

43%

the Philippines

22%

30%

43%

the Netherlands

47%

42%

Malaysia

17%

41%

the United Kingdom

48%

37%

224

India

20%

39%

35%

640

Austria

54%

35%

Germany

16%

45%

34%

625

Poland

53%

33%

12877

Switzerland

10%

51%

33%

South Africa

15%

52%

26%

Republic of Ireland

10%

75%

15%

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?