The stairway of the sky
Space exploration is the ongoing discovery and exploration of celestial structures in outer space by means of continuously evolving and growing space technology. While the study of space is carried out mainly by astronomers with telescopes, the physical exploration of space is conducted both by unmanned robotic space probes and human spaceflight.
The first successful human spaceflight was Vostok 1 ("East 1"), carrying 27-year-old Russian cosmonaut Yuri Gagarin on 12 April 1961. The spacecraft completed one orbit around the globe, lasting about 1 hour and 48 minutes. Gagarin's flight resonated around the world; it was a demonstration of the advanced Soviet space program and it opened an entirely new era of space exploration: human spaceflight.
A spaceflight typically begins with a rocket launch, which provides the initial thrust to overcome the force of gravity and propels the spacecraft from the surface of Earth. Once in space, the motion of a spacecraft—both when unpropelled and when under propulsion—is covered by the area of study called astrodynamics. Some spacecraft remain in space indefinitely, some disintegrate during atmospheric reentry, and others reach a planetary or lunar surface for landing or impact.
Most rocket engines are internal combustion heat engines (although non-com-busting forms exist). Rocket engines generally produce a high-temperature reaction mass, as a hot gas. This is achieved by com-busting a solid, liquid or gaseous fuel with an oxidizer within a combustion chamber. The extremely hot gas is then allowed to escape through a high-expansion ratio nozzle. This bell-shaped nozzle is what gives a rocket engine its characteristic shape. The effect of the nozzle is to dramatically accelerate the mass, converting most of the thermal energy into kinetic energy. Exhaust speed reaching as high as 10 times the speed of sound at sea level are common.
Rocket engines provide essentially the highest specific powers and high specific thrusts of any engine used for spacecraft propulsion.
Ion propulsion rockets can heat a plasma or charged gas inside a magnetic bottle and release it via a magnetic nozzle so that no solid matter need come in contact with the plasma. Of course, the machinery to do this is complex, but research into nuclear fusion has developed methods, some of which have been proposed to be used in propulsion systems, and some have been tested in a lab.
Acoustic levitation is a method for suspending matter in a medium by using acoustic radiation pressure from intense sound waves in the medium. And by this method, we can lift spacecraft to outer space by ultrasonic wave. As describe below.
A big transducer generates two ultrasonic sine waves, the deferential between two waves is full cycle wave, when both making high-pressure area and changing to decrease the amplitude of these waves which can lift the spacecraft to lower pressure area, by repeated waves can lift spacecraft to outer sphere.
Dropping spacecraft from outer sphere to the earth, the opposite way will be going to happen, by increasing the amplitude of ultrasonic sine wave which makes the spacecraft moving from the lower pressure area to high-pressure area.
Acoustic levitation forming waves like the stair and make spacecraft climbing to the outer sphere. As shown below:
The advantages of the stairway of the sky are:
1- Free Energy (Not needed for solid or liquid fuel as in the rackets).
2- Save traveling (No chemical reactions and big explosions).
3- Less expensive cost (No building rockets and no fuel).
4- Rocket launch.