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 Netherlands51
Australia101
France41
Republic of Ireland32
Greece34
Germany1229
Austria164
Unknown52
the United States600
Switzerland126
Poland20381
the United Kingdom299
Canada70
Pakistan54
the United Arab Emirates28
Malaysia24
India1067
the Philippines106
Nigeria25
Ghana26