Detailed text transcripts for TV channel - MSNBC - 20150327:02:58:00
Required to exercise a considerable amount every day for a couple of hours. i certainly don't do that. the focus of these studies is more on the details of our physiology. the space environment, there's a lot of radiation. we don't understand what that does to the human body. if one day we want to send people on a trip to mars that's going to take a couple of years. so we have to expand our knowledge of what it is and what it does to us to stay in space -- [ no audio ] >> i think -- mark can you still hear me? >> i can hear you now. >> our video is a little off. but what about the psychologica...