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

12%

24%

60%

Greece

45%

54%

Unknown

47%

50%

Australia

17%

27%

48%

Canada

15%

28%

46%

the United Kingdom

44%

42%

106

Malaysia

14%

42%

Indonesia

30%

40%

India

17%

38%

39%

320

the United States

14%

43%

38%

385

Germany

10%

50%

37%

the Philippines

32%

27%

35%

South Africa

16%

41%

33%

Poland

55%

31%

9947

the United Arab Emirates

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?