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Mars colonisation is a hype topic. What is the biggest threat for those wishing to take a part in a journey to Mars?

low temperatures

lack of oxygen

poor gravity

cosmic rays

The only efficient protection against high energetic cosmic radiation, one we are granted with, is Earth's magnetic field. Both during a long flight to Mars and through the stay on the planet, that did not form electromagnetic field, astronauts would be exposed to ionization.

smyru

3

FlyingSinger wikipedia → Health threat from cosmic rays

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6%

10%

6%

75%

48

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19%

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67%

100

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7%

21%

10%

60%

38

Greece

6%

21%

6%

59%

32

Republic of Ireland

6%

31%

3%

59%

32

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6%

28%

5%

56%

160

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26%

6%

54%

1170

Unknown

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11%

53%

52

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8%

50%

68

Poland

10%

30%

8%

48%

20064

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15%

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120

the United States

8%

33%

8%

47%

574

the United Kingdom

9%

33%

9%

46%

286

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11%

32%

11%

43%

53

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14%

28%

14%

39%

28

Malaysia

12%

33%

12%

37%

24

India

10%

37%

13%

36%

1064

the Philippines

10%

47%

9%

32%

106

Nigeria

8%

52%

8%

32%

25

Ghana

0%

53%

19%

23%

26

Olympus Mons is the largest known volcano. Where is it?

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In 1822 Jean-François Champollion translated ancient Egyptian hieroglyphs for the first time. What made this possible?

Thebes' Karnak temple inscriptions

papyrus Book of the Dead

Dead Sea scrolls