How does the space station never run out of oxygen? - Alvaro Romero-Calvo and Theo St Francis
TED-Ed · 2026-07-07
💡 Quick Take
1. Learn about the air supply systems used in space missions.
2. Understand the two requirements for creating breathable air in space: supplying oxygen and removing carbon dioxide.
3. Discover how early space missions met oxygen demands by storing oxygen in pressurized tanks.
4. Learn about the development of on-board oxygen generation systems using water and electrolysis.
5. Understand the process of electrolysis and how it breaks down water molecules into oxygen and hydrogen gases.
6. Learn about the challenges of separating bubbles from water in microgravity.
7. Discover the solution of pumping water through the electrolyzer to carry away bubbles to a separator.
8. Learn about the limitations of the current system and the need for new ways to separate gas.
9. Understand the concept of Magnetohydrodynamic Oxygen Generation Assembly (MOGA) and its potential to separate gases using magnets.
10. Learn about the benefits of MOGA, including reduced maintenance and replacement hardware, freeing up space onboard.
📊 Detailed Explanation
1. Learn about the air supply systems used in space missions: The air supply systems used in space missions are crucial for the survival of astronauts. The International Space Station (ISS) has revolutionized space missions with its reliable air supply systems. However, the need for regular maintenance, repairs, and upgrades has pushed engineers to develop even more reliable systems for future spacecraft.
2. Understand the two requirements for creating breathable air in space: Creating breathable air in space requires two main components: supplying oxygen and removing carbon dioxide. Astronauts need about 0.8 kilograms of oxygen a day, and the ISS has a robust recovery system that captures and purifies water from various sources, including sweat, exhalation, wash water, and urine.
3. Discover how early space missions met oxygen demands by storing oxygen in pressurized tanks: Early space missions, like the Apollo 11 mission, met oxygen demands by storing oxygen in pressurized tanks. However, this approach became impractical for longer missions, like the ISS, which required over a thousand kilograms of oxygen.
4. Learn about the development of on-board oxygen generation systems using water and electrolysis: Engineers developed a solution to generate oxygen on board using water and electrolysis. This process breaks down water molecules into oxygen and hydrogen gases, which can be separated and used for breathing.
5. Understand the process of electrolysis and how it breaks down water molecules into oxygen and hydrogen gases: Electrolysis is a process that breaks down water molecules into oxygen and hydrogen gases using an electric current. The process involves an electrolyzer, which has two electrodes, one positive and one negative, that apply an electric current to the water.
6. Learn about the challenges of separating bubbles from water in microgravity: In microgravity, bubbles tend to cling to the electrodes, making it challenging to separate them from the water. This problem is solved by pumping water through the electrolyzer to carry away bubbles to a separator.
7. Discover the solution of pumping water through the electrolyzer to carry away bubbles to a separator: The solution to separating bubbles from water in microgravity is to pump water through the electrolyzer to carry away bubbles to a separator. This separator uses a spinning motion to separate the gas from the liquid.
8. Learn about the limitations of the current system and the need for new ways to separate gas: The current system has limitations, including complex moving parts that are prone to breaking or malfunctioning. As space agencies set their sights on expeditions deeper into space, like year-long crewed trips to Mars, this approach becomes increasingly impractical.
9. Understand the concept of Magnetohydrodynamic Oxygen Generation Assembly (MOGA) and its potential to separate gases using magnets: MOGA is a new system that uses magnets to separate gases from water. This system takes advantage of the Lorentz force, which pushes charged molecules sideways when they move perpendicularly through a magnetic field.
10. Learn about the benefits of MOGA, including reduced maintenance and replacement hardware, freeing up space onboard: MOGA has several benefits, including reduced maintenance and replacement hardware, which frees up space onboard for other endeavors. This system also has no moving parts, making it more reliable and efficient.
🎯 Education Expert Opinion
As an education expert, I can see that the development of air supply systems in space missions is a critical area of research and development. The need for reliable and efficient systems is driven by the increasing duration of space missions, including year-long trips to Mars. The current system has limitations, including complex moving parts that are prone to breaking or malfunctioning. MOGA, on the other hand, offers a promising solution by using magnets to separate gases from water. This system has the potential to reduce maintenance and replacement hardware, freeing up space onboard for other endeavors. However, further research and development are needed to make MOGA a viable option for future space missions.
Another important aspect of this topic is the intersection of science, technology, engineering, and mathematics (STEM) education and space exploration. The development of air supply systems in space missions requires a multidisciplinary approach, involving experts from various fields, including physics, chemistry, engineering, and computer science. This highlights the importance of STEM education in preparing students for careers in space exploration and other high-tech fields.
Furthermore, the challenges faced by astronauts in space missions, such as the need for reliable air supply systems, also underscore the importance of experiential learning and hands-on training. Astronauts need to be trained to operate complex systems, troubleshoot problems, and adapt to new situations. This requires a combination of theoretical knowledge and practical skills, which can be developed through experiential learning and hands-on training.
In conclusion, the development of air supply systems in space missions is a critical area of research and development, driven by the increasing duration of space missions. MOGA offers a promising solution, but further research and development are needed to make it a viable option. The intersection of STEM education and space exploration highlights the importance of multidisciplinary approaches and experiential learning in preparing students for careers in high-tech fields.
Kanal: TED-Ed