gennady padalka has spent the longest time in space.
gennady padalka has spent the longest time in space.
who has spent the longest time in space?
gennady padalka
mars presents a hostile environment for human habitation. different technologies have been developed to assist long-term space exploration and may be adapted for habitation on mars. the existing record for the longest consecutive space flight is 438 days by cosmonaut valeri polyakov, and the most accrued time in space is 878 days by gennady padalka. the longest time spent outside the protection of the earth's van allen radiation belt is about 12 days for the apollo 17 moon landing. this is minor in comparison to the 1100-day journey planned by nasa as soon as the year 2028. scientists have also hypothesized that many different biological functions can be negatively affected by the environment of mars colonies. due to higher levels of radiation, there are a multitude of physical side-effects that must be mitigated. in addition martian soil contains high levels of toxins which are hazardous to human health.
colonization of mars
aleksandr kaleri









































aleksandr yuriyevich "sasha" kaleri (; born jūrmala, latvian ssr, ussr, 13 may 1956) is a russian cosmonaut and veteran of extended stays on the mir space station and the international space station (iss). kaleri has most recently been in space aboard the iss serving as a flight engineer for the long duration expedition 25/26 missions. he has spent the fourth-longest time in space of any person, the longest time in space of any currently active cosmonaut, and the longest time in space of any person not born in what is now russia.









































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aleksandr kaleri