Dragon (spacecraft)

Dragon is a spacecraft developed by SpaceX, an American private space transportation company based in Hawthorne, California. Dragon is launched into space by the SpaceX Falcon 9 two-stage-to-orbit launch vehicle, and SpaceX is developing a crewed version called the Dragon V2.

During its maiden flight in December 2010, Dragon became the first commercially built and operated spacecraft to be recovered successfully from orbit. On 25 May 2012, a cargo variant of Dragon became the first commercial spacecraft to successfully rendezvous with and attach to the International Space Station (ISS). SpaceX is contracted to deliver cargo to the ISS under NASA's Commercial Resupply Services program, and Dragon began regular cargo flights in October 2012.

SpaceX is additionally developing a crewed variant of the Dragon called Dragon V2. It will be able to carry up to seven astronauts, or some mix of crew and cargo, to and from low Earth orbit. The V2 heat shield is designed to withstand Earth re-entry velocities from Lunar and Martian spaceflights. SpaceX has received several U.S. Government contracts to develop the Dragon V2 crewed variant, including a Commercial Crew Development 2 (CCDev 2)-funded Space Act Agreement in April 2011, and a Commercial Crew integrated Capability (CCiCap)-funded space act agreement in August 2012.

Dragon

A dragon is a legendary creature, typically with serpentine or reptilian traits, that features in the myths of many cultures. There are two distinct cultural traditions of dragons: the European dragon, derived from European folk traditions and ultimately related to Greek and Middle Eastern mythologies, and the Chinese dragon, with counterparts in Japan (namely the Japanese dragon), Korea and other East Asian countries.

The two traditions may have evolved separately, but have influenced each other to a certain extent, particularly with the cross-cultural contact of recent centuries. The English word dragon derives from Greek δράκων (drákōn), "dragon, serpent of huge size, water-snake".

Name

The word dragon entered the English language in the early 13th century from Old French dragon, which in turn comes from Latin draconem (nominative draco) meaning "huge serpent, dragon", from the Greek word δράκων, drakon (genitive drakontos, δράκοντος) "serpent, giant seafish". The Greek and Latin term referred to any great serpent, not necessarily mythological, and this usage was also current in English up to the 18th century.

Dragon V2

Dragon V2 (aka Crew Dragon or Dragon 2, and formerly DragonRider) is the second version of the SpaceX Dragon spacecraft which will be a human-rated vehicle capable of making a terrestrial soft landing. It includes a set of four side-mounted thruster pods with two SuperDraco engines each which can serve as a Launch Abort System (LAS) or be used for propulsive landings. In addition, it has much larger windows, landing legs which extend from the bottom of the spacecraft, new computers and avionics, and redesigned solar arrays, all packaged in a spacecraft with a changed outer mold line from the initial cargo Dragon that has been flying for several years.

The spacecraft was unveiled on May 29, 2014 during a press event at SpaceX headquarters in Hawthorne, California. Designed to ferry astronauts to space, the capsule differs considerably from the cargo-carrying Dragon, which has been operational since 2010. Dragon V2 is scheduled to make its first flight in December 2016 and to carry its first astronaut crew in April 2017. SpaceX completed a launch pad abort test of the spacecraft on 6 May 2015 and a hovering test on 24 November 2015.

Space station

A space station, also known as an orbital station or an orbital space station, is a spacecraft capable of supporting a crew, which is designed to remain in space (most commonly as an artificial satellite in low Earth orbit) for an extended period of time and for other spacecraft to dock. A space station is distinguished from other spacecraft used for human spaceflight by lack of major propulsion or landing systems. Instead, other vehicles transport people and cargo to and from the station. As of September 2014 two space stations are in orbit: the International Space Station, which is permanently manned, and China's Tiangong-1 (which successfully launched on September 29, 2011), which is unmanned most of the time. Previous stations include the Almaz and Salyut series, Skylab and most recently Mir.

Today's space stations are research platforms, used to study the effects of long-term space flight on the human body as well as to provide platforms for greater number and length of scientific studies than available on other space vehicles. Each crew member staying aboard the station for weeks or months, but rarely more than a year. Most of the time crew remain at station but its not necessary that crew should have to be stay at station. Since the ill-fated flight of Soyuz 11 to Salyut 1, all manned spaceflight duration records have been set aboard space stations. The duration record for a single spaceflight is 437.7 days, set by Valeriy Polyakov aboard Mir from 1994 to 1995. As of 2013, three astronauts have completed single missions of over a year, all aboard Mir.

International Space Station

The International Space Station (ISS) is a space station, or a habitable artificial satellite, in low Earth orbit. Its first component launched into orbit in 1998, and the ISS is now the largest artificial body in orbit and can often be seen with the naked eye from Earth. The ISS consists of pressurised modules, external trusses, solar arrays, and other components. ISS components have been launched by Russian Proton and Soyuz rockets as well as American Space Shuttles.

The ISS serves as a microgravity and space environment research laboratory in which crew members conduct experiments in biology, human biology, physics, astronomy, meteorology, and other fields. The station is suited for the testing of spacecraft systems and equipment required for missions to the Moon and Mars. The ISS maintains an orbit with an altitude of between 330 and 435 km (205 and 270 mi) by means of reboost manoeuvres using the engines of the Zvezda module or visiting spacecraft. It completes 15.54 orbits per day.