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Atmospheric entry is the movement of an object from outer space into and through the gases of an atmosphere of a planet , dwarf planet or natural satellite . There are two main types of atmospheric entry: uncontrolled entry, such as the entry of astronomical objects , space debris or bolides ; and controlled entry (or reentry) of a spacecraft capable of being navigated or following a predetermined course. Technologies and procedures allowing the controlled atmospheric e ntry, d escent and l anding of spacecraft are collectively abbreviated as EDL .
Atmospheric drag and aerodynamic heating can cause atmospheric breakup capable of completely disintegrating smaller objects. These forces may cause objects with lower compressive strength to explode.
Ballistic warheads and expendable vehicles do not require slowing at re-entry, and in fact, are made streamlined so as to maintain their speed.
A system for generating three-dimensional objects by creating a cross-sectional pattern of the object to be formed at a selected surface of a fluid medium capable of ...
Atmospheric entry is the movement of an object from outer space into and through the gases of an atmosphere of a planet, dwarf planet or natural satellite.
Part 1 . Hiroyuki Jo, a 29 year old ethnic Korean, was flanked by two assistants. As his target approached, Jo turned towards one of his accomplices who handed ...
The U.S. Air Force will delay issuing a request for proposals (RFP) for the T-X jet trainer replacement program by three months “to ensure the release of a well-defined RFP.” The service said it now expects to release the RFP in late December.
In a March 18 notice, the Air Force Materiel Command program executive office for mobility said its decision to refine the solicitation stems from the service’s “Bending the Cost Curve” acquisition reform initiative. Air Force Secretary Deborah Lee James announced the initiative in January 2015, describing it as an approach to driving down costs and increasing competition by engaging industry throughout the acquisition life cycle. The initiative is aimed at T-X and three other programs: the long-range standoff weapon, Multi-Adaptive Podded System and Space-based Infrared System.
Efforts to refine the RFP language of the T-X program, which have included extensive dialogue with industry, “have taken longer than initially anticipated to complete,” the service stated in its latest notice. The process has caused it to postpone the full operational capability date of the new trainer from Fiscal Year 2032 to FY2034; however, the planned initial operational capability date of FY2024 remains unchanged.
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A fighter aircraft is a military aircraft designed primarily for air-to-air combat against other aircraft,  as opposed to bombers and attack aircraft , whose main mission is to attack ground targets. The hallmarks of a fighter are its speed, maneuverability, and small size relative to other combat aircraft.
Many fighters have secondary ground-attack capabilities, and some are designed as dual-purpose fighter-bombers ; often aircraft that do not fulfill the standard definition are called fighters. This may be for political or national security reasons, for advertising purposes, or other reasons. 
The word "fighter" did not become the official English-language term for such aircraft until after World War I. In the British Royal Flying Corps and Royal Air Force these aircraft were referred to as " scouts " into the early 1920s. The U.S. Army called their fighters "pursuit" aircraft from 1916 until the late 1940s. In most languages a fighter aircraft is known as a hunter , or hunting aircraft ( avion de chasse, Jagdflugzeuge, avión de caza etc.). Exceptions include Russian, where a fighter is an "истребитель" (pronounced "istrebitel"), meaning "exterminator", and Hebrew where it is "matose krav" (literally "battle plane").