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%

Romania

33%

60%

Unknown

47%

50%

France

48%

the United States

12%

39%

44%

514

the Philippines

24%

26%

44%

Canada

13%

33%

44%

Australia

15%

35%

43%

Greece

52%

43%

Malaysia

17%

41%

Austria

50%

40%

the United Arab Emirates

40%

the United Kingdom

10%

44%

39%

195

the Netherlands

11%

52%

35%

India

19%

40%

34%

581

Poland

53%

33%

11938

Germany

14%

47%

33%

328

Switzerland

12%

54%

33%

South Africa

13%

46%

33%

Republic of Ireland

73%

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?