Product Code Database
Example Keywords: shoes -stitch $66
   » » Wiki: Spacecraft
Tag Wiki 'Spacecraft'.
Tag

A spacecraft is a vehicle or machine designed to . A type of artificial satellite, spacecraft are used for a variety of purposes, including communications, Earth observation, meteorology, , space colonization, planetary exploration, and of humans and . All spacecraft except single-stage-to-orbit vehicles cannot get into space on their own, and require a (carrier rocket).

On a sub-orbital spaceflight, a enters and then returns to the surface without having gained sufficient energy or velocity to make a full . For orbital spaceflights, spacecraft enter closed orbits around the or around other celestial bodies. Spacecraft used for human spaceflight carry people on board as crew or passengers from start or on orbit () only, whereas those used for robotic space missions operate either or . Robotic spacecraft used to support scientific research are . Robotic spacecraft that remain in orbit around a planetary body are artificial . To date, only a handful of interstellar probes, such as Pioneer 10 and 11, Voyager 1 and 2, and , are on trajectories that leave the .

Orbital spacecraft may be recoverable or not. Most are not. Recoverable spacecraft may be subdivided by a method of reentry to Earth into non-winged and winged . Recoverable spacecraft may be reusable (can be launched again or several times, like the and the Space Shuttle orbiters) or expendable (like the Soyuz). In recent years, more space agencies are tending towards reusable spacecraft.

Humanity has achieved space flight, but only a few nations have the technology for orbital launches: (RSA or "Roscosmos"), the (), the member states of the European Space Agency (ESA), (), (), (), National Chung-Shan Institute of Science and Technology, Taiwan National Space Organization (NSPO), (ISA), (ISA), and (NADA). In addition, several private companies have developed or are developing the technology for orbital launches independently from government agencies. The most prominent examples of such companies are and .


History
A German V-2 became the first spacecraft when it reached an altitude of 189 km in June 1944 in Peenemünde, Germany. Peenemünde (Dokumentation) Berlin: Moewig, 1984.. Sputnik 1 was the first artificial satellite. It was launched into an elliptical low Earth orbit (LEO) by the on 4 October 1957. The launch ushered in new political, military, technological, and scientific developments; while the Sputnik launch was a single event, it marked the start of the .Dougall, Walter A. (Winter 2010) "Shooting the duck", American Heritage Apart from its value as a technological first, Sputnik 1 also helped to identify the upper atmospheric layer's density, through measuring the satellite's orbital changes. It also provided data on -signal distribution in the . Pressurized in the satellite's false body provided the first opportunity for detection. Sputnik 1 was launched during the International Geophysical Year from Site No.1/5, at the 5th range, in (now at the Baikonur Cosmodrome). The satellite traveled at , taking 96.2 minutes to complete an orbit, and emitted radio signals at 20.005 and 40.002 

While Sputnik 1 was the first spacecraft to orbit the Earth, other man-made objects had previously reached an altitude of 100 km, which is the height required by the international organization Fédération Aéronautique Internationale to count as a spaceflight. This altitude is called the Kármán line. In particular, in the 1940s there were several test launches of the V-2 rocket, some of which reached altitudes well over 100 km.


Spacecraft types

Crewed spacecraft
As of 2016, only three nations have flown crewed spacecraft: USSR/Russia, USA, and China. The first crewed spacecraft was Vostok 1, which carried Soviet cosmonaut into space in 1961, and completed a full Earth orbit. There were five other crewed missions which used a Vostok spacecraft. The second crewed spacecraft was named Freedom 7, and it performed a sub-orbital spaceflight in 1961 carrying American astronaut to an altitude of just over . There were five other crewed missions using .

Other Soviet crewed spacecraft include the Voskhod, , flown uncrewed as Zond/L1, L3, , and the and crewed . Other American crewed spacecraft include the , the Apollo spacecraft including the Apollo Lunar Module, the space station, the Space Shuttle with undetached European and private US space stations-modules, and the SpaceX Crew Dragon configuration of their Dragon 2. US company also developed and flown a spacecraft of their own, the , commonly referred to as , but a crewed flight is yet to occur. China developed, but did not fly Shuguang, and is currently using (its first crewed mission was in 2003).

Except for the Space Shuttle, all of the recoverable crewed orbital spacecraft were .

File:NASA spacecraft comparison.jpg|alt=Drawings of Mercury, Gemini capsules and Apollo spacecraft, with their launch vehicles|American Mercury, Gemini, and Apollo spacecraft File:Vostok Spacecraft Diagram.svg|Soviet Vostok capsule File:Voskhod 1 and 2.svg|alt=Line drawing of Voskhod capsules|Soviet Voskhod (variant of Vostok) File:Soyuz 7K-OK(A) drawing.svg|alt=Soyuz 7K-OK(A) drawing|1967 Soviet/Russian Soyuz spacecraft File:Post S-7 Shenzhou spacecraft.png|alt=Drawing of Shenzhou spacecraft|Chinese Shenzhou spacecraft

The International Space Station, crewed since November 2000, is a joint venture between Russia, the United States, Canada and several other countries.


Spaceplanes
Spaceplanes are spacecraft are built in the shape of, and function as, . The first example of such was the North American X-15 spaceplane, which conducted two crewed flights which reached an altitude of over 100 km in the 1960s. This first reusable spacecraft was air-launched on a suborbital trajectory on July 19, 1963.

The first partially reusable orbital spacecraft, a winged non-capsule, the , was launched by the USA on the 20th anniversary of 's flight, on April 12, 1981. During the Shuttle era, six orbiters were built, all of which have flown in the atmosphere and five of which have flown in space. Enterprise was used only for approach and landing tests, launching from the back of a Boeing 747 SCA and gliding to deadstick landings at Edwards AFB, California. The first Space Shuttle to fly into space was Columbia, followed by Challenger, Discovery, Atlantis, and Endeavour. Endeavour was built to replace Challenger when it was lost in January 1986. Columbia broke up during reentry in February 2003.

The first automatic partially reusable spacecraft was the , launched by the USSR on November 15, 1988, although it made only one flight and this was uncrewed. This was designed for a crew and strongly resembled the U.S. Space Shuttle, although its drop-off boosters used liquid propellants and its main engines were located at the base of what would be the external tank in the American Shuttle. Lack of funding, complicated by the dissolution of the USSR, prevented any further flights of Buran. The Space Shuttle was subsequently modified to allow for autonomous re-entry in case of necessity.

Per the Vision for Space Exploration, the Space Shuttle was retired in 2011 mainly due to its old age and high cost of program reaching over a billion dollars per flight. The Shuttle's human transport role is to be replaced by 's SpaceX Dragon 2 and 's CST-100 Starliner. Dragon 2's first crewed flight occurred on May 30, 2020. The Shuttle's heavy cargo transport role is to be replaced by expendable rockets such as the Space Launch System and ULA's Vulcan rocket, as well as the commercial launch vehicles.

Scaled Composites' was a reusable suborbital that carried pilots and on consecutive flights in 2004 to win the Ansari X Prize. The Spaceship Company will build its successor . A fleet of SpaceShipTwos operated by was planned to begin reusable private spaceflight carrying paying passengers in 2014, but was delayed after the crash of VSS Enterprise.


Uncrewed spacecraft
Uncrewed spacecraft are spacecraft without people onboard. Uncrewed spacecraft may have varying levels of autonomy from human input; they may be remote controlled, remote guided or even autonomous, meaning they have a pre-programmed list of operations, which they will execute unless otherwise instructed.

Many space missions are more suited to telerobotic rather than crewed operation, due to lower cost and lower risk factors. In addition, some planetary destinations such as or the vicinity of are too hostile for human survival. Outer planets such as , , and are too distant to reach with current crewed spaceflight technology, so telerobotic probes are the only way to explore them. Telerobotics also allows exploration of regions that are vulnerable to contamination by Earth micro-organisms since spacecraft can be sterilized. Humans can not be sterilized in the same way as a spaceship, as they coexist with numerous micro-organisms, and these micro-organisms are also hard to contain within a spaceship or spacesuit. Multiple space probes were sent to study Moon, the planets, the Sun, multiple small Solar System bodies (comets and asteroids).

Special class of uncrewed spacecraft is , a in outer space used to observe astronomical objects. The first operational telescopes were the American Orbiting Astronomical Observatory, OAO-2 launched in 1968, and the Soviet Orion 1 ultraviolet telescope aboard space station Salyut 1 in 1971. Space telescopes avoid the filtering and distortion (scintillation) of electromagnetic radiation which they observe, and avoid which ground-based observatories encounter. The best-known examples are Hubble Space Telescope and James Webb Space Telescope.

are designed to carry , possibly to support ' operation by transporting food, propellant and other supplies. Automated cargo spacecraft have been used since 1978 and have serviced Salyut 6, Salyut 7, , the International Space Station and space station.


Fastest spacecraft
  • Parker Solar Probe (estimated at first sun close pass, will reach at final perihelion)
  • I and II Solar Probes ()


Furthest spacecraft from the Sun
  • Voyager 1 at 156.13 AU as of April 2022, traveling outward at about
  • Pioneer 10 at 122.48 AU as of December 2018, traveling outward at about
  • Voyager 2 at 122.82 AU as of January 2020, traveling outward at about
  • Pioneer 11 at 101.17 AU as of December 2018, traveling outward at about


Subsystems
A spacecraft system comprises different subsystems, depending on the mission profile. Spacecraft subsystems comprise the spacecraft's and may include attitude determination and control (variously called ADAC, ADC, or ACS), guidance, navigation and control (GNC or GN&C), communications (comms), command and data handling (CDH or C&DH), power (EPS), thermal control (TCS), propulsion, and structures. Attached to the bus are typically .

Life support
Spacecraft intended for human spaceflight must also include a life support system for the crew.

Attitude control
A Spacecraft needs an attitude control subsystem to be correctly oriented in space and respond to external and forces properly. The attitude control subsystem consists of and , together with controlling algorithms. The attitude-control subsystem permits proper pointing for the science objective, sun pointing for power to the solar arrays and earth pointing for communications.

GNC
Guidance refers to the calculation of the commands (usually done by the CDH subsystem) needed to steer the spacecraft where it is desired to be. Navigation means determining a spacecraft's or position. Control means adjusting the path of the spacecraft to meet mission requirements.

Command and data handling
The C&DH subsystem receives commands from the communications subsystem, performs validation and decoding of the commands, and distributes the commands to the appropriate spacecraft subsystems and components. The CDH also receives housekeeping data and science data from the other spacecraft subsystems and components, and packages the data for storage on a or transmission to the ground via the communications subsystem. Other functions of the CDH include maintaining the spacecraft clock and state-of-health monitoring.

Communications
Spacecraft, both robotic and crewed, utilize various communications systems for communication with terrestrial stations as well as for communication between spacecraft in space. Technologies utilized include RF and optical communication. In addition, some spacecraft payloads are explicitly for the purpose of ground–ground using electronic technologies.

Power
Spacecraft need an electrical power generation and distribution subsystem for powering the various spacecraft subsystems. For spacecraft near the , solar panels are frequently used to generate electrical power. Spacecraft designed to operate in more distant locations, for example , might employ a radioisotope thermoelectric generator (RTG) to generate electrical power. Electrical power is sent through power conditioning equipment before it passes through a power distribution unit over an electrical bus to other spacecraft components. Batteries are typically connected to the bus via a battery charge regulator, and the batteries are used to provide electrical power during periods when primary power is not available, for example when a low Earth orbit spacecraft is by Earth.

Thermal control
Spacecraft must be engineered to withstand transit through Earth's atmosphere and the space environment. They must operate in a with temperatures potentially ranging across hundreds of degrees as well as (if subject to reentry) in the presence of plasmas. Material requirements are such that either high melting temperature, low density materials such as and reinforced carbon–carbon or (possibly due to the lower thickness requirements despite its high density) or carbon–carbon composites are used. Depending on mission profile, spacecraft may also need to operate on the surface of another planetary body. The thermal control subsystem can be passive, dependent on the selection of materials with specific radiative properties. Active thermal control makes use of electrical heaters and certain such as louvers to control temperature ranges of equipments within specific ranges.

Spacecraft propulsion
Spacecraft may or may not have a propulsion subsystem, depending on whether or not the mission profile calls for propulsion. The Swift spacecraft is an example of a spacecraft that does not have a propulsion subsystem. Typically though, LEO spacecraft include a propulsion subsystem for altitude adjustments (drag make-up maneuvers) and adjustment maneuvers. A propulsion system is also needed for spacecraft that perform momentum management maneuvers. Components of a conventional propulsion subsystem include fuel, tankage, valves, pipes, and . The thermal control system interfaces with the propulsion subsystem by monitoring the temperature of those components, and by preheating tanks and thrusters in preparation for a spacecraft maneuver.

Structures
Spacecraft must be engineered to withstand launch loads imparted by the launch vehicle, and must have a point of attachment for all the other subsystems. Depending on mission profile, the structural subsystem might need to withstand loads imparted by entry into the atmosphere of another planetary body, and landing on the surface of another planetary body.

Payload
The payload depends on the mission of the spacecraft, and is typically regarded as the part of the spacecraft "that pays the bills". Typical payloads could include scientific instruments (, , or particle detectors, for example), cargo, or a human crew.

Ground segment

The , though not technically part of the spacecraft, is vital to the operation of the spacecraft. Typical components of a ground segment in use during normal operations include a mission operations facility where the flight operations team conducts the operations of the spacecraft, a data processing and storage facility, to radiate signals to and receive signals from the spacecraft, and a voice and data communications network to connect all mission elements.

Launch vehicle
The propels the spacecraft from Earth's surface, through the , and into an , the exact orbit being dependent on the mission configuration. The launch vehicle may be expendable or reusable.


See also
  • Commercial astronaut
  • List of crewed spacecraft
  • List of fictional spacecraft
  • Spacecraft design
  • Space exploration
  • Spaceships in science fiction
  • Spaceflight records
  • Timeline of Solar System exploration
  • U.S. Space Exploration History on U.S. Stamps


Citations

Sources


External links

Page 1 of 1
1
Page 1 of 1
1

Account

Social:
Pages:  ..   .. 
Items:  .. 

Navigation

General: Atom Feed Atom Feed  .. 
Help:  ..   .. 
Category:  ..   .. 
Media:  ..   .. 
Posts:  ..   ..   .. 

Statistics

Page:  .. 
Summary:  .. 
1 Tags
10/10 Page Rank
5 Page Refs
4s Time