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%

Unknown

47%

50%

Australia

12%

35%

48%

Austria

43%

48%

Canada

14%

30%

47%

Greece

50%

45%

the United States

12%

40%

43%

469

the Philippines

26%

42%

France

52%

42%

the Netherlands

15%

46%

38%

the United Kingdom

10%

46%

37%

173

Malaysia

18%

43%

37%

India

18%

40%

35%

484

Switzerland

57%

35%

Poland

54%

32%

11215

Germany

13%

49%

32%

191

South Africa

15%

46%

30%

the United Arab Emirates

46%

30%

Republic of Ireland

72%

18%

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?