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Garment worn to keep a human alive in the harsh environment of outer space

A space suit or spacesuit is a garment worn to keep a human alive in the harsh environment of outer space, vacuum and temperature extremes. Space suits are often worn inside spacecraft as a safety precaution in case of loss of cabin pressure, and are necessary for extravehicular activity (EVA), work done outside spacecraft. Space suits have been worn for such work in Earth orbit, on the surface of the Moon, and en route back to Earth from the Moon. Modern space suits augment the basic pressure garment with a complex system of equipment and environmental systems designed to keep the wearer comfortable, and to minimize the effort required to bend the limbs, resisting a soft pressure garment's natural tendency to stiffen against the vacuum. A self contained oxygen supply and environmental control system is frequently employed to allow complete freedom of movement, independent of the spacecraft. Three types of space suits exist for different purposes: IVA (intravehicular activity), EVA (extravehicular activity), and IEVA (intra/extravehicular activity). IVA suits are meant to be worn inside a pressurized spacecraft, and are therefore lighter and more comfortable. IEVA suits are meant for use inside and outside the spacecraft, such as the Gemini G4C suit. They include more protection from the harsh conditions of space, such as protection from micrometeoroids and extreme temperature change. EVA suits, such as the EMU, are used outside spacecraft, for either planetary exploration or spacewalks. They must protect the wearer against all conditions of space, as well as provide mobility and functionality. The latter two figures add to , which is why many modern space suits do not use , but (this is a slight overcorrection, as alveolar partial pressures at sea level are slightly less than the former). In space suits that use 20.7 kPa, the astronaut gets only 20.7 kPa − 11.6 kPa = of oxygen, which is about the alveolar oxygen partial pressure attained at an altitude of above sea level. This is about 42% of normal partial pressure of oxygen at sea level, about the same as pressure in a commercial passenger jet aircraft, and is the realistic lower limit for safe ordinary space suit pressurization which allows reasonable capacity for work.

When space suits below a specific operating pressure are used from craft that are pressurized to normal atmospheric pressure (such as the Space Shuttle), this requires astronauts to "pre breathe" (meaning pre breathe pure oxygen for a period) before donning their suits and depressurizing in the air lock. This procedure purges the body of dissolved nitrogen, so as to avoid decompression sickness due to rapid depressurization from a nitrogen containing atmosphere. despite contrary depictions in some popular science fiction. Consciousness is retained for up to 15 seconds as the effects of oxygen starvation set in. No snap freeze effect occurs because all heat must be lost through thermal radiation or the evaporation of liquids, and the blood does not boil because it remains pressurized within the body, but human flesh expands up to about twice its volume due to ebullism in such conditions, giving the visual effect of a body builder rather than an overfilled balloon. In space, there are highly energized subatomic particles that can cause radiation damage by disrupting essential biological processes. Exposure to radiation can create problems via two methods: the particles can react with water in the human body to produce free radicals that break DNA molecules apart, or by directly breaking the DNA molecules. Temperature in space can vary extremely depending on the exposure to radiant energy sources. Temperatures from solar radiation can reach up to , and in its absence, down to Because of this, space suits must provide sufficient insulation and cooling for the conditions in which they will be used. The most immediate hazard is in attempting to hold one's breath during explosive decompression as the expansion of gas can damage the lungs by overexpansion rupture. These effects have been confirmed through various accidents (including in very high altitude conditions, outer space and training vacuum chambers). Human skin does not need to be protected from vacuum and is gas tight by itself.

The Mercury IVA, the first U. S. space suit design, included lights at the tips of the gloves in order to provide visual aid. As the need for extravehicular activity grew, suits such as the Apollo A7L included gloves made of a metal fabric called Chromel r in order to prevent punctures. In order to retain a better sense of touch for the astronauts, the fingertips of the gloves were made of silicone. With the shuttle program, it became necessary to be able to operate spacecraft modules, so the ACES suits featured gripping on the gloves. EMU gloves, which are used for spacewalks, are heated to keep the astronaut's hands warm. The Phase VI gloves, meant for use with the Mark III suit, are the first gloves to be designed with "laser scanning technology, 3D computer modeling, stereo lithography, laser cutting technology and CNC machining". This allows for cheaper, more accurate production, as well as increased detail in joint mobility and flexibility.

Prior to the Apollo missions, life support in space suits was connected to the space capsule via an umbilical cable. However, with the Apollo missions, life support was configured into a removable capsule called the Portable Life Support System that allowed the astronaut to explore the Moon without having to be attached to the space craft. The EMU space suit, used for spacewalks, allows the astronaut to manually control the internal environment of the suit. The Mark III suit has a backpack containing about 12 pounds of liquid air for breathing, pressurization, and heat exchange. (скафандр also means "diving suit"). Emilio Herrera designed and built a full pressure "stratonautical space suit" in 1935, which was to have been used during an open basket balloon stratospheric flight scheduled for early 1936. Wiley Post experimented with a number of pressure suits for record breaking flights. Russell Colley created the space suits worn by the Project Mercury astronauts, including fitting Alan Shepard for his ride as America's first man in space on May 5, 1961.

SK series (CK)the spacesuit used for the Vostok program (1961–1963). Worn by Yuri Gagarin on the first crewed space flight. No pressure suits were worn aboard Voskhod 1. Berkut (Беркут meaning "golden eagle")the spacesuit was a modified SK 1 used by the crew of Voskhod 2 which included Alexei Leonov on the first spacewalk during (1965). From Soyuz 1 to Soyuz 11 (1967–1971) no pressure suits were worn during launch and reentry. Yastreb (Ястреб meaning "hawk")extravehicular activity spacesuit used during a crew exchange between Soyuz 4 and Soyuz 5 (1969). Krechet 94 (Кречет meaning "gyrfalcon")designed for the canceled Soviet crewed Moon landing. Strizh (Стриж meaning "swift (bird)")developed for pilots of Buran class orbiters. Sokol (Сокол meaning "falcon")suits worn by Soyuz crew members during launch and reentry. They were first worn on Soyuz 12. They have been used from 1973 to present. Orlan (Орлан meaning "sea eagle" or "bald eagle")suits for extravehicular activity, originally developed for the Soviet lunar program as a lunar orbit EVA suit. It is Russia's current EVA suit. Used from 1977 to present.

In the early 1950s, Siegfried Hansen and colleagues at Litton Industries designed and built a working hard shell suit, which was used inside vacuum chambers and was the predecessor of space suits used in NASA missions. Navy Mark IV high altitude/vacuum suitused for Project Mercury (1961–1963). Gemini space suits (1965–1966)there were three main variants developed: G3C designed for intra vehicle use; G4C specially designed for EVA and intra vehicle use; and a special G5C suit worn by the Gemini 7 crew for 14 days inside the spacecraft. Manned Orbiting Laboratory MH 7 space suits for the canceled MOL program. Apollo Block I A1C suit (1966–1967)a derivative of the Gemini suit, worn by primary and backup crews in training for two early Apollo missions. The nylon pressure garment melted and burned through in the Apollo 1 cabin fire. This suit became obsolete when crewed Block I Apollo flights were discontinued after the fire. Apollo/Skylab A7L EVA and Moon suitsThe Block II Apollo suit was the primary pressure suit worn for eleven Apollo flights, three Skylab flights, and the US astronauts on the Apollo–Soyuz Test Project between 1968 and 1975. The pressure garment's nylon outer layer was replaced with fireproof Beta cloth after the Apollo 1 fire. This suit was the first to employ a liquid cooled inner garment and outer micrometeoroid garment. Beginning with the Apollo 13 mission, it also introduced "commander's stripes" so that a pair of space walkers will not appear identical on camera. Shuttle Ejection Escape Suitused from STS 1 (1981) to STS 4 (1982) by a two man crew used in conjunction with the then installed ejection seats. Derived from a USAF model. These were removed once the Shuttle became certified. From STS 5 (1982) to STS 51 L (1986) no pressure suits were worn during launch and reentry. The crew would wear only a blue flight suit with an oxygen helmet. Launch Entry Suit first used on STS 26 (1988), the first flight after the Challenger disaster. It was a partial pressure suit derived from a USAF model. It was used from 1988 to 1998. Advanced Crew Escape Suit used on the Space Shuttle starting in 1994. The Advanced Crew Escape Suit or ACES suit, is a full pressure suit worn by all Space Shuttle crews for the ascent and entry portions of flight. The suit is a direct descendant of the United States Air Force high altitude pressure suits worn by SR 71 Blackbird and U 2 spy plane pilots, North American X 15 and Gemini pilot astronauts, and the Launch Entry Suits worn by NASA astronauts starting on the STS 26 flight. It is derived from a USAF model. Extravehicular Mobility Unit (EMU)used on both the Space Shuttle and International Space Station (ISS). The EMU is an independent anthropomorphic system that provides environmental protection, mobility, life support, and communications for a Space Shuttle or ISS crew member to perform an EVA in Earth orbit. Used from 1982 to present, but only available in limited sizing as of 2019. Aerospace company SpaceX developed an IVA suit which is worn by astronauts involved in Commercial Crew Program missions operated by SpaceX since the Demo 2 mission (see #SpaceX suit ("Starman suit")). As a continuation of this suit design, SpaceX developed an EVA suit in 2024. The EVA version of the suit will be used during the Polaris Dawn private space mission for the first ever commercial spacewalk. Orion Crew Survival System (OCSS)will be used during launch and re entry on the Orion MPCV. It is derived from the Advanced Crew Escape Suit but is able to operate at a higher pressure and has improved mobility in the shoulders.

In February 2015, SpaceX began developing a space suit for astronauts to wear within the Dragon 2 space capsule. Its appearance was jointly designed by Jose Fernandez—a Hollywood costume designer known for his works for superhero and science fiction films—and SpaceX founder and CEO Elon Musk. The first images of the suit were revealed in September 2017. A mannequin, called "Starman" (after David Bowie's song of the same name), wore the SpaceX space suit during the maiden launch of the Falcon Heavy in February 2018. For this exhibition launch, the suit was not pressurized and carried no sensors. The suit, which is suitable for vacuum, offers protection against cabin depressurization through a single tether at the astronaut's thigh that feeds air and electronic connections. The helmets, which are 3D printed, contain microphones and speakers. As the suits need the tether connection and do not offer protection against radiation, they are not used for extra vehicular activities. The suits are custom made for each astronaut. In 2018, NASA commercial crew astronauts Bob Behnken, and Doug Hurley tested the spacesuit inside the Dragon 2 spacecraft in order to familiarize themselves with the suit. They wore it in the Crew Dragon Demo 2 flight launched on 30 May 2020.

Shuguang space suit: First generation EVA space suit developed by China for the 1967 canceled Project 714 crewed space program. It has a mass of about , has an orange colour, and is made of high resistance multi layer polyester fabric. The astronaut could use it inside the cabin and conduct an EVA as well. 'Project 863 space suit: Cancelled project of second generation Chinese EVA space suit. Shenzhou IVA (神舟) space suit: The suit was first worn by Yang Liwei on Shenzhou 5, the first crewed Chinese space flight, it closely resembles a Sokol KV2 suit, but it is believed to be a Chinese made version rather than an actual Russian suit. Pictures show that the suits on Shenzhou 6 differ in detail from the earlier suit; they are also reported to be lighter. Haiying (海鹰号航天服) EVA space suit: The imported Russian Orlan M EVA suit is called Haiying. Used on Shenzhou 7. Feitian (飞天号航天服) EVA space suit: Indigenously developed Chinese made EVA space suit also used for the Shenzhou 7 mission. The suit was designed for a spacewalk mission of up to seven hours. Chinese astronauts have been training in the out of capsule space suits since July 2007, and movements are seriously restricted in the suits, with a mass of more than each. A new generation of Feitian space suit has been used since 2021 as the construction of Tiangong Space Station began.

Several companies and universities are developing technologies and prototypes which represent improvements over current space suits.

3D printing (additive manufacturing) can be used to reduce the mass of hard shell space suits while retaining the high mobility they provide. This fabrication method also allows for the potential for in situ fabrication and repair of suits, a capability which is not currently available, but will likely be necessary for Martian exploration. The University of Maryland began development of a prototype 3D printed hard suit in 2016, based on the kinematics of the AX 5. The prototype arm segment is designed to be evaluated in the Space Systems Laboratory glovebox to compare mobility to traditional soft suits. Initial research has focused on the feasibility of printing rigid suit elements, bearing races, ball bearings, seals, and sealing surfaces.

There are certain difficulties in designing a dexterous space suit glove and there are limitations to the current designs. For this reason, the Centennial Astronaut Glove Challenge was created to build a better glove. Competitions have been held in 2007 and 2009, and another is planned. The 2009 contest required the glove to be covered with a micro meteorite layer.

Since 2009, the Austrian Space Forum has been developing "Aouda. X", an experimental Mars analogue space suit focusing on an advanced human–machine interface and on board computing network to increase situational awareness. The suit is designed to study contamination vectors in planetary exploration analogue environments and create limitations depending on the pressure regime chosen for a simulation. Since 2012, for the Mars2013 analogue mission by the Austrian Space Forum to Erfoud, Morocco, the Aouda. X analogue space suit has a sister in the form of Aouda. S. This is a slightly less sophisticated suit meant primarily to assist Aouda. X operations and be able to study the interactions between two (analogue) astronauts in similar suits. The Aouda. X and Aouda. S space suits have been named after the fictional princess from the Jules Verne's 1873 novel Around the World in Eighty Days. A public display mock up of Aouda. X (called Aouda. D) is currently on display at the Dachstein Ice Cave in Obertraun, Austria, after the experiments done there in 2012.

Bio Suit is a space activity suit under development at the Massachusetts Institute of Technology, which as of 2006 consisted of several lower leg prototypes. Bio suit is custom fit to each wearer, using laser body scanning.

On August 2, 2006, NASA indicated plans to issue a Request for Proposal (RFP) for the design, development, certification, production, and sustaining engineering of the Constellation Space Suit to meet the needs of the Constellation Program. NASA foresaw a single suit capable of supporting: survivability during launch, entry and abort; zero gravity EVA; lunar surface EVA; and Mars surface EVA. On June 11, 2008, NASA awarded a US$745 million contract to Oceaneering International to create the new space suit.

Final Frontier Design (FFD) is developing a commercial full IVA space suit, with their first suit completed in 2010. FFD's suits are intended as a light weight, highly mobile, and inexpensive commercial space suits. Since 2011, FFD has upgraded IVA suit's designs, hardware, processes, and capabilities. FFD has built a total of 7 IVA space suit (2016) assemblies for various institutions and customers since founding, and has conducted high fidelity human testing in simulators, aircraft, microgravity, and hypobaric chambers. FFD has a Space Act Agreement with NASA's Commercial Space Capabilities Office to develop and execute a Human Rating Plan for FFD IVA suit. FFD categorizes their IVA suits according to their mission: Terra for Earth based testing, Stratos for high altitude flights, and Exos for orbital space flights. Each suit category has different requirements for manufacturing controls, validations, and materials, but are of a similar architecture.

The I Suit is a space suit prototype also constructed by ILC Dover, which incorporates several design improvements over the EMU, including a weight saving soft upper torso. Both the Mark III and the I Suit have taken part in NASA's annual Desert Research and Technology Studies (D RATS) field trials, during which suit occupants interact with one another, and with rovers and other equipment.

The Mark III is a NASA prototype, constructed by ILC Dover, which incorporates a hard lower torso section and a mix of soft and hard components. The Mark III is markedly more mobile than previous suits, despite its high operating pressure , which makes it a "zero prebreathe" suit, meaning that astronauts would be able to transition directly from a one atmosphere, mixed gas space station environment, such as that on the International Space Station, to the suit, without risking decompression sickness, which can occur with rapid depressurization from an atmosphere containing nitrogen or another inert gas.

The MX 2 is a space suit analogue constructed at the University of Maryland's Space Systems Laboratory. The MX 2 is used for crewed neutral buoyancy testing at the Space Systems Lab's Neutral Buoyancy Research Facility. By approximating the work envelope of a real EVA suit, without meeting the requirements of a flight rated suit, the MX 2 provides an inexpensive platform for EVA research, compared to using EMU suits at facilities like NASA's Neutral Buoyancy Laboratory. The MX 2 has an operating pressure of 2.5–4 psi. It is a rear entry suit, featuring a fiberglass HUT. Air, LCVG cooling water, and power are open loop systems, provided through an umbilical. The suit contains a Mac Mini computer to capture sensor data, such as suit pressure, inlet and outlet air temperatures, and heart rate. Resizable suit elements and adjustable ballast allow the suit to accommodate subjects ranging in height from , and with a weight range of .

Beginning in May 2006, five North Dakota colleges collaborated on a new space suit prototype, funded by a US$100,000 grant from NASA, to demonstrate technologies which could be incorporated into a planetary suit. The suit was tested in the Theodore Roosevelt National Park badlands of western North Dakota. The suit has a mass of without a life support backpack, and costs only a fraction of the standard US$12,000,000 cost for a flight rated NASA space suit. The suit was developed in just over a year by students from the University of North Dakota, North Dakota State, Dickinson State, the state College of Science and Turtle Mountain Community College. The mobility of the North Dakota suit can be attributed to its low operating pressure; while the North Dakota suit was field tested at a pressure of differential, NASA's EMU suit operates at a pressure of , a pressure designed to supply approximately sea level oxygen partial pressure for respiration (see discussion above).

NASA's Prototype eXploration Suit (PXS), like the Z series, is a rear entry suit compatible with suitports. The suit has components which could be 3D printed during missions to a range of specifications, to fit different individuals or changing mobility requirements.

A suitport is a theoretical alternative to an airlock, designed for use in hazardous environments and in human spaceflight, especially planetary surface exploration. In a suitport system, a rear entry space suit is attached and sealed against the outside of a spacecraft, such that an astronaut can enter and seal up the suit, then go on EVA, without the need for an airlock or depressurizing the spacecraft cabin. Suitports require less mass and volume than airlocks, provide dust mitigation, and prevent cross contamination of the inside and outside environments. Patents for suitport designs were filed in 1996 by Philip Culbertson Jr. of NASA's Ames Research Center and in 2003 by Joerg Boettcher, Stephen Ransom, and Frank Steinsiek.

In 2012, NASA introduced the Z 1 space suit, the first in the Z series of space suit prototypes designed by NASA specifically for planetary extravehicular activity. The Z 1 space suit includes an emphasis on mobility and protection for space missions. It features a soft torso versus the hard torsos seen in previous NASA EVA space suits, which reduces mass. It has been labeled the "Buzz Lightyear suit" due to its green streaks for a design. In 2014, NASA released the design for the Z 2 prototype, the next model in the Z series. NASA conducted a poll asking the public to decide on a design for the Z 2 space suit. The designs, created by fashion students from Philadelphia University, were "Technology", "Trends in Society", and "Biomimicry". The design "Technology" won, and the prototype is built with technologies like 3D printing. The Z 2 suit will also differ from the Z 1 suit in that the torso reverts to the hard shell, as seen in NASA's EMU suit.

The earliest space fiction ignored the problems of traveling through a vacuum, and launched its heroes through space without any special protection. In the later 19th century, however, a more realistic brand of space fiction emerged, in which authors have tried to describe or depict the space suits worn by their characters. These fictional suits vary in appearance and technology, and range from the highly authentic to the utterly improbable. A very early fictional account of space suits can be seen in Garrett P. Serviss' novel Edison's Conquest of Mars (1898). Later comic book series such as Buck Rogers (1930s) and Dan Dare (1950s) also featured their own takes on space suit design. Science fiction authors such as Robert A. Heinlein contributed to the development of fictional space suit concepts.