‘33,000 km Space Elevator’ First Preliminary Experiment

The only way to get into space right now is to ride a rocket. However, rockets must have tremendous power to get out of Earth orbit.

As a result of the calculations done by the scientists, we need the propulsion to fly at a speed of 11.2 km / s. This is called the second universe speed. There is also a risk of explosion on the way.

Is there any way to go to space more easily? There is a novel way scientists and engineers are studying this idea. The idea is to build an elevator that will go up to space. Like the elevator on the ground, it connects the cable from the Earth to a specific point in the universe.

This idea, which seemed ridiculous, came out in the nineteenth century, well over 100 years from now. In 1895, the former Soviet scientist Constantin Chiolkovsky, the father of the rocket, made his first public offer. At the time he was inspired by the Eiffel Tower in Paris, which rose high above the sky.

For the first time in more than 120 years since Chiolkowski’s proposal, a space elevator preliminary experiment takes place in space. The Japan Aerospace Exploration Agency (JAXA) launched a cargo space ship “Konotori No. 7” at the International Space Station at 2:52 am at Tanegashima Space Center in Kagoshima on the 23rd. The spacecraft is equipped with two pieces of “stars-me”, a 10-cm tiny satellite (Cubsat) for space elevator preliminary experiments, along with supplies to be sent to space station pilots.

Satellite maker Shizuoka University researchers plan to launch the mini-elevator on a 10-meter-long steel cable that connects the two satellites to space sooner or later. The size of the mini-elevator to travel between the two satellites on the cable is 3 cm by 6 cm high. The trial operation scene is shot with a camera built into the satellite.
Space elevator departure base to be installed in the sea near the equator.

.The space elevator aims to be installed in a stationary orbit with an altitude of 36,000 km. Why do I want to install at this height? At this height, it is easy to balance the gravitational pull of the earth to the ground and the centrifugal force that the satellites want to run out. Space elevators can be operated reliably by moving satellites here and moving them at the same speed as the earth and connecting cables. Space elevator construction is not built up from below, but is carried out by hanging cables down from satellites. If you build it from the bottom, you can not endure the earth’s gravity. When lowering the cable from above, it is necessary to balance the gravity and centrifugal force by hanging the additional cable in the opposite direction of the earth.

Of course, this experiment is just a very small first step. Space elevators have to go through a lot of difficulties to realize them. The biggest challenge is to create a powerful cable that can withstand the harsh environment of the universe. The researchers are expected to be at least 100 times stronger than steel. Carbon nanotubes are a strong candidate, but it has not yet been proven that it can withstand the enormous Earth’s gravity in space. In addition, there is no production technology that can make long cables with carbon nanotubes. US space developer Space X’s chief executive, Ilron Musk, is taking a negative stance on the idea of ​​space elevators based on this. He responded on his Twitter “Do not ask me about space elevators until I make carbon nanotubes longer than footbridge.” You should also provide a way to supply electricity to the space elevators and avoid collisions with space debris or meteorites that float around the universe.

Why do you want to challenge a space bar with high technical barriers? Scientists often pay for the cost savings. To send people and cargo to the universe by rocket, transportation usually costs $ 22,000 per kilogram. But if you use a space elevator, it will cost $ 200 per kilogram. Space elevators can be the best way to go to space in the future when space activities will become active if only they are realized. The second is high safety. It is much safer than launching satellites as they are fixed on cables. There is no risk of explosion because we do not use rockets. The researchers hope that when the space elevator is realized, it will arrive at the International Space Station 8 days later at a speed

Japanese construction company Obayashi Gumi, who is in charge of the project’s technical advisory, has already announced plans to supply space elevators by 2050 in 2014. According to this idea, Obayashi’s space elevator consists of six elliptical rooms. Each room can accommodate 30 people. The total length of cable used for space elevators is 96,000 km, including the opposite counterweight. The projected total construction cost is 9 billion dollars (10 trillion won).

In 1960, Russian scientist Yuri Artztnov made his first space elevator idea to hang cables from geostationary satellites. Scientific writer Arthur Clark has elaborated on this more precisely, and in 1979 he described in detail the process of building a space elevator in his novel, The Fountain of Paradise (1979). In Clarke’s novel, a middle station is installed at an altitude of 25,000 kilometers. The intermediate stop serves as a powerhouse for powering the elevator along with the passenger rest area. Clark says the reason for installing the intermediate station above the midpoint (18,000 km) is that the station will not fall to Earth if the top cable is disconnected. The “Paradise Fountain”, which gave Clark the Nobel Prize for science fiction, the Hugo Award and the Nebula Award, became a stimulus for NASA to seriously consider space elevators as the transportation system of the next century.

In fact, human beings have been imagining that they will ascend to the sky in a line since ancient times. In Korea, the fairy tale “Sun and Moon became a moon and the Moon, It is the story that the brother and sister are the sun and the sister becomes the moon. The tiger, who was chasing after them, climbs up on the rotten rope that the sky has given up, and falls down on the wind. The scene in which the Dongjun that came down from the sky burns the sister and goes up again reminds us of the space elevator. The stories of Jack and the Beanstock, which tells the story of a fairy tale that goes up and down the sky in the western oceans and the beanstalk that reaches the sky overnight, comes down.

Will the space elevator that has just taken its first steps become the rope of a sister and make the old imagination of mankind a reality, or will it be a tiger ‘

What is space speed?
In 1959, the former Soviet lunar probe “Luna No.1”, which achieved the speed of escape of the earth for the first time ever.

In 1959, the former Soviet lunar probe “Luna No.1”, which achieved the speed of escape of the earth for the first time ever.

The speed at which objects launched from the ground do not fall on the ground again, and they need to travel around the earth, or fly farther and reach other objects, are called universe speeds. There are three kinds of speed in space. The first is the speed at which you can continue to turn around the earth like a satellite. This is called the first space speed. This is equivalent to 7.9 km per second.

It is also called the orbital speed because it pays to draw a certain orbit. The second is the speed with which the Earth gravitational force can overcome its forces and escape from the Earth’s orbit. This is called the second universe velocity, the earth escape velocity. The speed is 11.2 km / sec. However, the second universe speed can not escape the sun. Much more power is needed to get out of the solar system. This is called the third space velocity. This corresponds to more than 16.7 km per second.

 

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