Analysis of information sources in references of the Wikipedia article "Space colonization" in English language version.
We are a circadian species, and if you don't have the proper lighting to maintain that chronobiology, it can create significant problems for crew members
Martian biological contamination may occur if astronauts breathe contaminated dust or if they contact material that is introduced into their habitat. If an astronaut becomes contaminated or infected, it is conceivable that he or she could transmit Martian biological entities or even disease to fellow astronauts, or introduce such entities into the biosphere upon returning to Earth. A contaminated vehicle or item of equipment returned to Earth could also be a source of contamination
see Chapter 7, Return to Mars – final section: Should we do away with human missions to sensitive targets
Martian biological contamination may occur if astronauts breathe contaminated dust or if they contact material that is introduced into their habitat. If an astronaut becomes contaminated or infected, it is conceivable that he or she could transmit Martian biological entities or even disease to fellow astronauts, or introduce such entities into the biosphere upon returning to Earth. A contaminated vehicle or item of equipment returned to Earth could also be a source of contamination
Robert Zubrin, said that the one word he shies away from is colony, preferring settlement because the first "confuses the issue with imperialism."
"We can then conclude that, under the parameters used for those simulations, a minimum crew of 98 settlers is needed for a 6,300-year multi-generational space journey towards Proxima Centauri b," say Marin and Beluffi.
see Chapter 7, Return to Mars – final section: Should we do away with human missions to sensitive targets
We are a circadian species, and if you don't have the proper lighting to maintain that chronobiology, it can create significant problems for crew members
