What Do You Know About Aeronautics And Astronautics?

Explanation
Mil Mi-8 is the most-produced helicopter in history. It was first introduced in 1961 and has been widely used by various countries around the world. The Mil Mi-8 is known for its versatility and reliability, making it a popular choice for both military and civilian purposes. Its production numbers surpass any other helicopter, making it the clear answer to this question.

Explanation
Air balloons are not considered aircraft because they do not have a propulsion system and cannot be controlled or maneuvered like airplanes, helicopters, and airships. While they can be used for recreational purposes and provide a means of transportation, they rely on wind currents for movement and lack the ability to navigate in a controlled manner.

Explanation
Geolocation is not a criterion by which aircrafts may be classified because it does not define the characteristics or features of an aircraft. The lift type refers to the mechanism used by an aircraft to generate lift, aircraft propulsion refers to the method used to propel the aircraft forward, and usage refers to the purpose or role of the aircraft. However, geolocation does not provide any information about the aircraft's classification or characteristics.

Explanation
The Cessna 172 Skyhawk is the most-produced aircraft in history. This is because it has been in production since 1956 and has seen continuous demand from both private pilots and flight training schools. The Cessna 172 is known for its reliability, ease of use, and versatility, making it a popular choice among pilots worldwide. Its long production history and widespread use contribute to its status as the most-produced aircraft in history.

Explanation
The US Space Shuttle flew a total of 135 times from 1981 to 2011. This indicates the number of missions completed by the Space Shuttle during its operational period.

Explanation
Airspace refers to the physical air space directly above a location on the ground. It is the area where aircraft operate and includes different types of airspace such as controlled airspace, restricted airspace, and prohibited airspace. This term is used to define and regulate the use of the airspace to ensure safe and efficient air travel. The other options, Aerospace, Atmosphere, and Stratosphere, do not specifically refer to the physical air space directly above a location on the ground.

Explanation
Pioneer 9 is not an interstellar spacecraft because it was launched in 1968 and its mission was to study the interplanetary space between Earth and Venus, not to venture beyond our solar system. In contrast, Pioneer 10 and Pioneer 11 were both interstellar spacecrafts that explored the outer regions of our solar system, while New Horizons is a spacecraft that was launched in 2006 with the goal of studying Pluto and the Kuiper Belt.

Explanation
Russia is the correct answer because as of 2016, Russia has flown manned spacecrafts. This implies that Russia has successfully launched and operated spacecrafts with human crew members on board.

Explanation
Aviation is the correct answer because it encompasses all aspects of aeronautics, including aeronautical science, aerodynamics, and aeronautical engineering. It refers to the operation and maintenance of aircraft, as well as the study and development of flight technology. Aeronautical science, aerodynamics, and aeronautical engineering are all subfields within the broader field of aviation.

Explanation
Compressible flow is the branch of fluid mechanics that deals with flows having significant changes in fluid density. This type of flow occurs when the fluid density changes due to changes in pressure, temperature, or velocity. In compressible flow, the density of the fluid is not constant and can vary significantly. This branch of fluid mechanics is important in various fields such as aerospace engineering, where understanding the behavior of fluids at high speeds and altitudes is crucial.