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.
reach: rather globalastronauticsastronomyMarsphysicsplanetsSolar Systemtechnology
Answers by country
low temperatures
lack of oxygen
poor gravity
cosmic rays
answers
the Netherlands
48
Australia
100
France
38
Republic of Ireland
32
Austria
160
Greece
30
Germany
1155
Unknown
52
Canada
68
Poland
20006
the United States
560
the United Kingdom
284
Switzerland
115
Pakistan
53
the United Arab Emirates
28
Malaysia
24
India
1061
the Philippines
106
Nigeria
25
Ghana
25