Bodhidharma

History

The first scientific approaches of the problem of the space flight go back to the end of the 19th century when Constantin Tsiolkovski (1857-1935) described, in its work Исследованиемировыхпространствреактивнымиприборами (the exploration of cosmic space by means of machines with reaction) published in 1903, necessary technologies to reach the speed of placing in orbit (8km/s), in particular that of the multistage rocket S with Propergol S liquid (hydrogen/oxygen). However, this theoretical work had only one influence very limited apart from the Russia.

In 1919, the engineer states-unien Robert H. Goddard publishes off has Method Reaching Extreme Altitudes (a method to reach extreme altitudes), in which he explains the use of Tuyères of of Laval within the framework of rockets with liquid propellents, in order to produce the power necessary to a space flight. This paper influenced the German engineers largely Hermann Oberth and Wernher von Braun, future key actors of modern astronautics.

October 3rd 1942, the latter make take off the first rocket S to reach space: it is about a rocket A4, more known under the designation of V2. This event marks the launching of the first industrial production of rockets, V2 being the common ancestor of the current ICBM and the modern space launchers. The step ahead that the technological success of V2 constitutes opened the way with the Space conquest.

Fifteen years later, on October 4th 1957, a rocket Soviet R-7 Semiorka place the first artificial satellite, Sputnik 1, orbits about it around the Earth and the first manned space flight is accomplished by the Soviet Cosmonaute Youri Gagarine, on April 12th 1961 on board Vostok 1.

At present, the rocket remains the only means used to free from the terrestrial revolved.

General information

One can distinguish several types of space flights according to the Orbite S described:

the ballistic flights, where the machine falls down on Ground;
the orbital flights, where the machine remains in rotation around the Earth;
the interplanetary flights, where the machine visits another planet;
the interstellar flights, where the machine moves towards another star.

It should be noted that of many space missions are made up of various phases raising of these categories. For example, certain Martian missions aim at placing an object in orbit around Mars and are thus made up of an interplanetary phase then of a phase orbitale.
In certain cases, one still moves towards other places, like the points of Lagrange, but the techniques remain identical.

Space flight at the beginning of the Earth

To reach space

The generally accepted definition of the limit between the terrestrial atmosphere and space is called Ligne of Kármán, of the name of the physicist hongro-American, Theodore von Kármán, which calculated altitude from which the atmosphere becomes too thin for aeronautical applications. This line is located at 100km altitude, but there exist references states-uniennes fixing the line of Kármán at 50 Miles of altitude, that is to say 80km, for reasons mnemotechnics.

Suborbital flight

At the time of a suborbital space flight, the spacecraft reaches space but does not put itself into orbit. So its trajectory brings back it towards the surface of the Earth. The suborbital flights can last several hours, and Pioneer 1, the first probe sent by NASA with an aim of reaching the the Moon is the example. A partial damage made take with the probe a suborbital trajectory of an altitude of: 113854km before penetrating in the atmosphere 43 hours after its launching.

May 17th, 2004, the Civilian Space exploration TEAM launched the rocket GoFast for the first flight suborbital space amateur. June 21st, 2004, SpaceShipOne was used for the first manned space flight with private financing.

Orbital flight

A orbital Vol minimal requires a speed much more important than a minimal suborbital flight, and, consequently, is technologically more difficult to realize. To arrive to an orbital flight, tangential speed around the Earth is as important as altitude reached. With a view to carry out a stable and durable flight, the speed of the spacecraft must make possible a closed orbit.

The direct rise

For the voyages interplantaires, it is not absolutely necessary to reach a closed orbit provided that the vessel reaches the Speed of exhaust. This speed is of 11km/s on Earth. It is in this manner that the very first Soviet space vehicles reached very high-altitudes without setting on orbit. NASA also studied the direct rise at the beginning of the Programme Apollo, in particular with the rocket Nova, but gave up the idea following considerations of mass. Several uninhabited space probes were sent by employing the direct rise, i.e. they did not carry out of orbit around the Earth before crossing space.

Currently, the plans for future the flight space inhabited often include/understand the assembly of the spacecraft in orbit around the Earth, excluding in fact this type of launching.

No shootings and astroport

A not of shooting is a fixed infrastructure conceived to allow the takeoff of aerospace vehicles. That generally consists of a tower of launching authorizing the access on the various floors of the launcher, as well as pit intended to accommodate the flame of the blast-off partly. The unit is surrounded by equipment making it possible to set up the launchers, to maintain them and to fill the tank. A Astroport can include several launching pads.

These two types of infrastructures are generally placed at the variation of the dwellings, for safety reasons and of sound pollution.

A launching can be done only in one quite precise window of time, defined by the position of the celestial bodies and their orbit relative in the site of launching. The principal influence is that of the Earth itself.

Re-entry in the atmosphere and landing/sea landing

Atmospheric re-entry

Landing and sea landing

Recovery

After a successful landing, the spacecraft, its occupants and his cargo can be recovered. It happens sometimes that this recovery is done in flight, therefore before the landing, while the spacecraft descent in parachute. A plane especially equipped the trap then with the vol. This method is used in particular to recover films coming from the satellites - Corona spies.

Launchers astronautics of single use

Launchers astronautics reusable

The first reusable spacecraft, the X-15, was launched since the airs on a suborbital trajectory on July 19th, 1963. The first spacecraft partially reusable and likely to be put into orbit, the space shuttle, were launched by the United States for the twentieth birthday of the flight of Youri Gagarine, on April 12th, 1981. Six shuttles of this type were built, all having flown in the terrestrial atmosphere and five of them having flown in space. The prototype shuttle, the Enterprise was not used that within the framework of tests of operation of approach and landing, was launched since the back of a Boeing 747 and landing while planing on the air base of Edwards. The first shuttle to reach space was Columbia , followed by Challenger , Discovery , Atlantis and Endeavor . The latter was built to replace Challenger which exploded in January 1986. Columbia , as for it, disaggregated at the time of its re-entry in the atmosphere in February 2003.

The first (and until now single) spacecraft partially reusable automatic was the Soviet shuttle Bourane, launched on November 15th, 1988, and not having realized that only one vol. This space Avion had been conceived to take along a human crew and strongly resembled its counterpart states-unienne, although the Soviet shuttle did not have clean principal engine. Lack of funds, worsened by the dissolution of the USSR, put an end prematurely to the program.

Technologies

One of the major aspects of the space flight resides in the means of Propulsion.

Technologies of space Propulsion used are numerous, but most current chemical Propulsion remains the , while the electric propulsion starts to be spread.

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