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retrograde rocket engine

См. также в других словарях:

  • Non-rocket spacelaunch — Non rocket space launch (NRS) is a launch into space where some or all needed speed and altitude is provided by non rocket means, rather than simply using conventional chemical rockets from the ground. A number of alternatives to rockets have… …   Wikipedia

  • Gravity turn — A gravity turn or zero lift turn is a maneuver (see trajectory optimization) used in launching a spacecraft into, or descending from, an orbit around a celestial body such as a planet or a moon. This launch trajectory offers two main advantages… …   Wikipedia

  • Orbital mechanics — A satellite orbiting the earth has a tangential velocity and an inward acceleration. Orbital mechanics or astrodynamics is the application of ballistics and celestial mechanics to the practical problems concerning the motion of rockets and other… …   Wikipedia

  • Oberth effect — In astronautics, the Oberth effect is where the use of a rocket engine when travelling at high speed generates much more useful energy than one at low speed. Oberth effect occurs because the propellant has more usable energy (due to its kinetic… …   Wikipedia

  • Retrorocket — A retrorocket (short for retrograde rocket ) is a rocket engine used to provide thrust opposing the motion of a spacecraft, thereby causing it to decelerate.HistoryOne of the first uses of retrorocket technology was in the Hajile project… …   Wikipedia

  • Tether propulsion — systems are proposals to use long, very strong cables (known as tethers) to change the velocity of spacecraft. The tethers may be used to initiate launch, complete launch, or alter the orbit of a spacecraft. Spaceflight using this form of… …   Wikipedia

  • Momentum exchange tether — Momentum Exchange Tethers is one of many applications for space tethers. This sub set represents an entire area of research using a spinning conductive and/or non conductive tether to throw spacecraft up or down in orbit (like a sling), thereby… …   Wikipedia

  • Corona (satellite) — Discoverer redirects here. For the database software, see Oracle Discoverer. For the R.E.M. song, see Discoverer (song). KH 3 and KH3 redirect here. For the upcoming third game in the Kingdom Hearts series, see Kingdom Hearts (series). KH 4B… …   Wikipedia

  • Jupiter — /jooh pi teuhr/, n. 1. Also called Jove. the supreme deity of the ancient Romans: the god of the heavens and of weather. Cf. Zeus. 2. Astron. the planet fifth in order from the sun, having an equatorial diameter of 88,729 mi. (142,796 km), a mean …   Universalium

  • J2 — J2, J02, J.II or J 2 may refer to : * J2 (album), a 2008 album featuring the collaboration of Justin Broadrick (Godflesh, Jesu) and Jarboe (Swans) * J2 (comics), a comicbook character * j2 Global Communications, a tech company best known for… …   Wikipedia

  • Apollo 8 — Infobox Space mission mission name = Apollo 8 insignia = Apollo 8 patch.png command module = CM 103 mass 28,817 kg service module = SM 103 lunar module = Lunar Test Article (LTA B) mass 9,026 kg booster = Saturn V SA 503 crew size = 3 launch pad …   Wikipedia

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