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
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Very interesting!
reach: rather globalastronauticsastronomyMarsphysicsplanetsSolar Systemtechnology

Answers by country

low temperatures
lack of oxygen
poor gravity
cosmic rays
answers
flagAustralia
0%
11%
9%
78%
42
flagthe Netherlands
4%
4%
9%
76%
21
flagSpain
0%
23%
7%
69%
13
flagGermany
4%
20%
8%
67%
135
flagGreece
6%
26%
0%
66%
15
flagAustria
0%
30%
7%
61%
13
flagIndonesia
8%
33%
0%
58%
12
flagSwitzerland
11%
22%
5%
55%
18
flagthe United Kingdom
5%
31%
9%
54%
118
flagPakistan
8%
29%
4%
54%
24
flagUnknown
11%
23%
11%
53%
52
flagSouth Africa
8%
33%
8%
50%
12
flagPoland
11%
31%
8%
47%
16301
flagCanada
10%
37%
5%
45%
40
flagRepublic of Ireland
9%
45%
0%
45%
11
flagthe United States
8%
35%
9%
42%
296
flagthe United Arab Emirates
10%
31%
10%
42%
19
flagIndia
9%
37%
13%
36%
456
flagthe Philippines
5%
46%
11%
35%
54
flagMalaysia
15%
30%
15%
30%
13