How long will astronauts return from ISS, know here
Vinod Kumar Srivastava, former scientist at the Indian Space Research Organization (ISRO), says that the NASA-SpasX’s spacecraft will reach and do dock on March 15. After this, these four new astronauts will handle the work of Crew-9. Members of Crew-9 will leave for Earth on 19 March. If the situation is fine, Sunita Williams and Buch Willmore will return to Earth in March itself. It can take 2 to 5 days. The spacecroft from which these passengers will come will be in the Atlantic Ocean. The process of landing on earth is called Splashdown.
Many times the mission has shocked, this was the reason
The mission of NASA’s astronaut Sunita Williams and Barry Wilmore, stuck in the International Space Station (ISS) for the past 9 months, had recently shocked the mission of homecoming. Even before this, the mission has suffered a setback. After reaching the international space station on 5 June last year, there was a problem of helium leakage in the spacecraft. Its 5 thrusters also deteriorated. Even there were problems in the service module to provide electricity to the vehicle.
Entry will hit at a speed of 7.8 km per second
According to ISRO Scientist Vinod Kumar Srivastava, any item will have to keep a speed of 7.8 km per second for entry into the lower orbit of the Earth. Since Spacean has high kinetic energy, this energy needs to be preserved for entry into the earth’s atmosphere. This is why retrig that has to be used for re-entry in the atmosphere of the Earth. Crew members should slow down space vehicles to subconian speed before using parachutes or air brakes.
Mac will enter Earth at 1 speed
Subconic speed is less speed at the speed of sound. The speed of sound on the sea level is about 768 miles per hour (1,236 km per hour). It is known as ‘Mac 1’. Subconnic airplanes, commercial airliners, private jets and military airplanes fly at a speed of MAC 0.6 from Mac 0.6.
What can be challenged in return now?
Vinod Kumar Srivastava says that the re-entry is particularly dangerous for the space shuttle. A time during which shuttle has to undergo more pressure and high temperature. In fact, two different events work to heat the shuttle, compressive heating and friction. The ISS is at an altitude of 300 km from the earth. When a vehicle enters the earth’s atmosphere at an altitude of about 100 kilometers from the earth, then it will be able to return to the earth successfully. In this, a little omission will return to the universe and can keep circling it.
The return of Sunita Williams and Buch Wilmore will now be possible. SpaceX’s vehicle has gone to pick them up. However, the challenges in their way of returning to the earth have not diminished. The most important is the re-entry of the vehicle in the Earth’s atmosphere. During this time it will be necessary to keep a special speed and special angle. Otherwise, the vehicle will keep going round or a big accident may happen.
Vinod Kumar Srivastava, former Scientist, ISRO
It is necessary to have this angle for entry
Vinod Kumar Srivastava says that while entering the earth, the angle of the vehicle should be from 94.71 degrees to 99.80 degrees. After entering the atmosphere of the earth from every entry angle, the upper part of the capsule will be burnt and the bottom part, in which the passengers live, come down from the parachute.
Re-entry is done at a speed of 28 thousand km
Initially, the shuttle revolves around the Earth at a tremendous speed in the emptiness of space. Astronauts slow down the speed by running some thrusters and the gravity starts pulling the shuttle into the lower orbit. As the shuttle comes down, it starts getting closer to the Earth’s atmosphere at a speed of 17,000 mph, ie about 28,000 kilometers. During the re-entry, the shuttle is going so fast that it presses the air ahead.
The shuttle gets so hot that it can melt
The air layers near the front edges of the shuttle are pressed, leading to the air temperature to 3000 degrees forens. By staying in contact with the shuttle, it heats the surface of the shuttle. Generally, so much temperature will melt anything. From the rock of the meteor, it can also melt the metal of the spacecraft. This is the reason why shuttle requires a layer of insulation, so that its outer edges do not become so hot.
What are the coating of the insulation of the shuttle
The shuttle enters the atmosphere on such an angle that its nose and lower part comes in contact with the wind and presses it on a very high pressure. During this time, the heat emanated from it absorbs. his/her help in this work is useful, which is made of silica. It is heat resistant. These silica tiles do not allow shuttles to heat up. If these tiles are not there, the temperature of the outer layer of the shuttle can reach 3000 degrees and this can melt the shuttle.
