The NASA Extravehicular Mobility Unit, (EMU), is a specially designed spacesuit that enables astronauts to perform extravehicular activities (EVAs) in the harsh environment of space. These activities typically include spacewalks and repairs outside of spacecraft and space stations.
The EMU is a high-tech spacesuit that provides astronauts with life support systems, mobility, and protection against the vacuum of space, extreme temperatures, and micrometeoroid impacts. It consists of several components, including the Primary Life Support System (PLSS), the Hard Upper Torso (HUT), and the Extravehicular Visor Assembly (EVVA).
The EMU's life support system supplies oxygen, regulates temperature, and removes exhaled carbon dioxide. Its mobility features include a specially designed Joint Bearings and Roll Bearings (JBREs) that allow astronauts to move their limbs with precision. The visor assembly provides protection against solar radiation and micrometeoroids.
