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.
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Very interesting!
reach: rather globalastronauticsastronomyMarsphysicsplanetsSolar Systemtechnology

Answers by country

low temperatures
lack of oxygen
poor gravity
cosmic rays
answers
flagthe Netherlands
4%
4%
8%
79%
24
flagAustralia
4%
12%
6%
76%
63
flagSpain
0%
21%
7%
71%
14
flagGermany
7%
18%
6%
67%
191
flagFrance
7%
21%
7%
64%
14
flagGreece
5%
26%
0%
63%
19
flagAustria
8%
21%
8%
60%
23
flagRepublic of Ireland
6%
33%
0%
60%
15
flagSwitzerland
9%
22%
4%
59%
22
flagthe United Kingdom
7%
29%
8%
53%
141
flagUnknown
11%
23%
11%
53%
52
flagPakistan
10%
26%
6%
53%
30
flagSouth Africa
14%
28%
7%
50%
14
flagPoland
11%
31%
8%
47%
16743
flagCanada
10%
34%
4%
45%
46
flagthe United States
9%
35%
9%
43%
328
flagthe United Arab Emirates
10%
35%
10%
40%
20
flagIndia
9%
37%
13%
36%
575
flagthe Philippines
7%
48%
10%
31%
66
flagMalaysia
15%
30%
15%
30%
13