What properties do sunspots have?

Lower temperature and strong electric field

Higher temperature

Lower temperature and strong magnetic field

These are holes in the photosphere

Sunspots are temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic field flux that inhibit convection.

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Answers by country

France

84%

Republic of Ireland

14%

64%

21%

Canada

22%

61%

11%

the United States

15%

58%

10%

271

Estonia

58%

41%

Austria

13%

19%

56%

the United Arab Emirates

38%

53%

Poland

13%

16%

52%

16%

5240

the Philippines

22%

51%

17%

Pakistan

15%

50%

19%

the United Kingdom

21%

15%

48%

13%

122

India

16%

19%

47%

13%

366

Greece

20%

45%

15%

Germany

27%

16%

43%

10%

451

Australia

14%

34%

37%

11%

the Netherlands

22%

16%

33%

16%

Switzerland

26%

32%

13%

What are the most luminous objects in the universe?

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

What is the name of the hypothetical last stage of the evolution of Sun-sized stars?