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How does a Spacesuit work? (NASA)
Jared Owen
Overview
This video explains the essential functions and components of a spacesuit, emphasizing its role as a personal spacecraft. It details the layers and systems within NASA's current Extravehicular Activity (EVA) spacesuit, the EMU, highlighting how it provides oxygen, maintains pressure, regulates temperature, and protects astronauts from the harsh space environment. The summary also touches upon the evolution of spacesuits, from early designs to future models like the AxEMU for Artemis missions, and explains the challenges of mobility and the importance of life support systems.
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Chapters
- Earth's atmosphere provides essential conditions for human survival: breathable air, pressure, moderate temperature, and protection from radiation and micrometeoroids.
- Space lacks these conditions, making it immediately lethal to unprotected humans due to vacuum, extreme temperatures, and radiation.
- Spacesuits act as individual spacecraft, replicating Earth's life-sustaining environment to enable astronauts to survive and work in space.
- Spacesuits must balance robust protection with the flexibility required for astronauts to perform complex tasks.
Understanding why spacesuits are critical highlights the extreme hostility of the space environment and the sophisticated engineering required to overcome it.
Without a spacesuit, an astronaut would lose consciousness in seconds and die within minutes due to the vacuum and lack of oxygen in space.
- Spacesuit design has evolved significantly since the 1960s, with improvements for different space programs like Apollo and the Space Shuttle.
- Internal (IVA) suits offer limited protection for use inside spacecraft during emergencies.
- External (EVA) suits provide extensive protection for spacewalks, allowing astronauts to work outside for extended periods.
- Newer suits are being developed by commercial companies and for future missions like Artemis, aiming for enhanced capabilities.
Recognizing the different types and historical development of spacesuits shows how engineering solutions adapt to evolving mission requirements and technological advancements.
The EMU suit, still used today, was initially designed for the Space Shuttle and later upgraded for the International Space Station (ISS).
- The EMU suit consists of two main parts: the Pressure Garment System (shaped like a person) and the Portable Life Support System (PLSS) backpack.
- Astronauts wear a Maximum Absorption Garment (MAG) for hygiene and a Liquid Cooling Ventilation Garment (LCVG) with tubing to circulate water and manage body temperature.
- The pressure garment has multiple layers, including a pressure bladder (like a balloon) and a restraint layer (like a backpack strap) to maintain internal pressure and support movement.
- Additional layers, the Thermo-Micrometeoroid Garment, provide insulation against extreme temperatures and protection from small debris, while the outer ortho-fabric offers further durability.
Deconstructing the spacesuit into its layered components reveals the intricate design needed to simultaneously contain pressure, regulate temperature, and allow for movement.
The Liquid Cooling Ventilation Garment (LCVG) has nearly 100 meters of tubing to circulate water against the astronaut's skin, acting as a crucial cooling system.
- The Hard Upper Torso (HUT) is a rigid fiberglass shell where other suit components attach, including arm joints and the helmet.
- Integrated systems within the HUT allow for drinking water and feature a display and control module for monitoring suit status.
- The Lower Torso Assembly connects to the HUT via a seal and includes waist bearings for limited rotation.
- Bearings in the suit's joints allow for rotation while maintaining an airtight seal, though astronauts must learn specific movements ('programming') to conserve energy.
Understanding the structural elements like the HUT and Lower Torso Assembly clarifies how the suit's rigid and flexible parts are integrated to form a functional whole.
The control box text is mirrored because astronauts view it using a small mirror on their wrist, as they cannot see the front panel directly.
- The PLSS backpack is the 'life support' hub, containing critical systems for survival during spacewalks.
- It houses batteries for power, primary and backup oxygen tanks for breathing, and canisters to remove carbon dioxide.
- Water tanks supply the LCVG for cooling, and a fan/pump circulates air and water.
- A sublimator uses ice to vent heat into space, and sensors monitor system status, while a radio enables communication.
The PLSS demonstrates the complex, self-contained environmental control system necessary for an astronaut's survival outside the spacecraft.
The PLSS includes a sublimator that turns frozen ice into gas to vent heat away from the suit, a critical part of thermal regulation.
- Putting on an EMU spacesuit is a complex process requiring assistance, with the suit weighing approximately 275 pounds on Earth.
- The suit is assembled in sections: MAG, LCVG, Lower Torso, Upper Torso, Communications cap, gloves, and helmet.
- The next-generation AxEMU suit for Artemis missions features a rear-entry design for easier donning and improved flexibility, allowing astronauts to crouch and kneel.
- Future suits will incorporate advanced PLSS technology for longer missions and enhanced mobility, crucial for lunar surface exploration.
Comparing the process of donning current and future suits highlights the ongoing efforts to improve astronaut safety, efficiency, and capability for space exploration.
The AxEMU suit opens from the back, allowing astronauts to climb in feet first, making the process significantly easier and faster than current suits.
Key takeaways
- Spacesuits are essentially miniature, human-shaped spacecraft designed to replicate Earth's life-sustaining environment in the vacuum of space.
- The EMU spacesuit is a complex system of layered materials and integrated components that provide pressure, oxygen, temperature control, and protection.
- Effective thermal management is crucial, achieved through both insulation layers and active cooling systems like the Liquid Cooling Ventilation Garment (LCVG).
- The Portable Life Support System (PLSS) backpack is the suit's command center, managing oxygen, CO2 removal, power, and cooling.
- Mobility within spacesuits is a significant engineering challenge, requiring specialized joint designs and astronaut training to perform tasks efficiently.
- Future spacesuits, like the AxEMU, are being developed to offer greater flexibility, easier donning, and enhanced capabilities for lunar and Martian exploration.
Key terms
SpacesuitExtravehicular Activity (EVA)Intravehicular Activity (IVA)Pressure Garment SystemPortable Life Support System (PLSS)Liquid Cooling Ventilation Garment (LCVG)Hard Upper Torso (HUT)Thermo-Micrometeoroid GarmentSublimatorSAFER (Simplified Aid For EVA Rescue)
Test your understanding
- What are the four primary environmental conditions provided by Earth's atmosphere that a spacesuit must replicate for astronaut survival?
- How does the Liquid Cooling Ventilation Garment (LCVG) contribute to an astronaut's comfort and safety during a spacewalk?
- What is the function of the Portable Life Support System (PLSS) and what are its key components?
- Why is mobility a significant challenge in spacesuit design, and how do current and future suits attempt to address this?
- What is the main difference in design and purpose between an IVA suit and an EVA suit?