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

18%

72%

Pakistan

11%

23%

61%

Greece

46%

53%

Canada

13%

27%

51%

Unknown

47%

50%

Switzerland

10%

40%

50%

Australia

12%

33%

48%

the United Kingdom

47%

41%

125

Malaysia

20%

40%

Indonesia

30%

40%

the United States

13%

43%

38%

397

India

18%

38%

337

the Philippines

30%

25%

38%

Austria

15%

46%

38%

Germany

10%

49%

37%

Poland

55%

31%

10230

the United Arab Emirates

46%

30%

South Africa

15%

46%

30%

Singapore

10%

60%

30%

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?