His costume is made of alien materials, including a retracting transparent facemask and life support system, and retractable solar wind collector wings.
The state-of-the-art life support system makes saltwater using fresh city water and artificial sea salt while filtering 100 percent of the water every hour.
This underestimates the difference in the case of interstellar missions, given the vastly greater travel times involved and the resulting necessity of a closed-cycle life support system.
