By Chris Deziel, Updated August 30, 2022
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Venturing into space demands more than a weekend bag. In the vacuum of space, humans survive only about 15 seconds without a protective shell, and even brief exposure to solar radiation can deliver lethal doses. A well‑designed spacecraft—such as the International Space Station (ISS)—provides not only a pressurized habitat but also robust shielding against cosmic and solar particles.
NASA’s ISS demonstrates the most efficient waste‑recycling system currently in use. The station reuses approximately 93 % of its wastewater, converting it into potable water and breathable oxygen. Additionally, it vent‑gases hazardous byproducts—like hydrogen and methane—into space, preventing explosive buildup.
Every astronaut carries a personal water reserve, as water is essential for hydration, sanitation, and processing dehydrated meals. Preferred space foods are designed to be non‑crumbly, reducing the risk of loose particles clogging equipment. Long‑duration crews require a diverse menu to maintain balanced nutrition; taste perception diminishes in microgravity, so many astronauts favor spicy flavors to stimulate their senses.
Maintaining hygiene is critical. Astronauts on the ISS use sponge showers, soap, and shampoo formulated to work without water. Each crew member has a toothbrush and toothpaste to prevent dental issues—there is no dentist on board. To counteract muscle atrophy and bone loss, astronauts engage in at least two hours of daily exercise using cycle ergometers, treadmills, or the Advanced Resistive Exercise Device.
Music and recreational activities help preserve a sense of normalcy. ISS crews keep guitars, flutes, and saxophones on board, and they record jam sessions in microgravity. Beyond music, astronauts rely on books, CDs, and internet‑capable computers to stay connected with loved ones and access information.
For detailed protocols, consult NASA’s Human Research Program and related publications.
