Occasionally, there are a series of scenic spots called “bottomless pits” around the world. They seem to be bottomless. In fact, such caves often bottom out in the next few tens of meters. Even if there are deep caves, there is no such thing as a “bottomless”.
Let us imagine that humans can dig a real bottomless pit by themselves? What would it be like?
Can you dig through the earth?
Under the conditions of sufficient manpower and material resources, can humans manually excavate a bottomless cave? This idea is obviously too naive.
Be aware that under the earth’s crust, the closer to the center of the earth, the higher the temperature and pressure. The earth’s core is highly radioactive, with temperatures exceeding 2,200 ° C, which can melt, boil or sublimate any material known in the world.
Graphene may be a good candidate if you must find a particular material that is sufficient to build a cylindrical tube that can penetrate the center of the earth without being afraid of being dissolved. Graphene is a special form of carbon combination that is more indestructible than diamonds and can be produced in the form of carbon nanotubes, which are hollow inside. This means that graphene nanotubes can be used not only to build bottomless walls, but also to inject ultra-cold liquids (such as liquid helium), circulate inside the walls to cool, and prevent the core temperature from melting the walls.
With a stable bottomless tunnel constructed of graphene nanotubes, jump into it and greet you with a journey of more than 12,000 kilometers. However, even if you are daring, if you jump into the hole like a parachute, you will not go too far in this journey, whether or not you have a parachute.
Near the earth’s surface, when the planet turns, the atmosphere follows all the objects of the person and the ground moving together at a speed of 1000 kilometers per hour, and varies according to the latitude of the place. But as you move away from the ground and into the interior of the Earth, you will find that the ground moves too fast. The entire earth rotates at the same angular velocity, but like a circular turntable, the internal components have a lower line speed than the outer parts, which means that falling into the bottomless hole from the surface will inevitably hit the wall of the cylindrical bottomless pipe.
But we only need to find the point where we dig the hole, we can avoid the above accidents – excavating from the pole of the Arctic, directly establishing the bottomless tunnel along the axis of rotation of the earth, and the exit on the other side of the hole is undoubtedly The pole of the South Pole.
In this way, the difference in the rotational speed of the Earth’s surface and inside will disappear completely, and a perfect straight channel will run through the whole earth!
What happens when you jump into a bottomless pit?
In the face of this real bottomless pit, jump forward! What follows is the ever-increasing speed of the drop. After about 7 seconds, the speed will reach 140-210 miles per hour. Gravitation will then become weaker and weaker, as most of the earth’s mass will run on your head, not underneath you. At the same time, as the air density of the filling shaft becomes larger and larger, your speed of descent will be greatly reduced by the air resistance.
Due to air resistance, you will need about 20 to 24 hours of fall to get through the long journey of 6,400 kilometers and reach the center of the earth. At this time, your drop speed will drop to 48 kilometers per hour, almost flying at a speed. In a few minutes, you will find yourself stopping the fall. It turns out that you are trapped in the center of the earth by gravity.
Did you give up like this? Scientists are reluctant to face this reality, and they will make another revision to solve this physics problem.
According to the theory, it is only necessary to discharge 100% of the air in the bottomless hole, so that the inside of the bottomless pipeline that crosses the earth along the axis of rotation becomes a vacuum, then the person who falls into it will not be affected by the air resistance, and finally limit The speed factor is defined only by gravitation.
In this way, after jumping into the vacuum bottomless pit, we will continue to accelerate and fall. When reaching the center of the earth, the maximum speed will exceed 11,000 meters per second, which is about 40,000 kilometers per hour! At such an alarming rate, we descended from the surface through the vacuum pipe to the center of the earth, only about 22 minutes, and because there is no air resistance, we will not face the loss of energy.
Later, we will gradually move away from the center of the earth, through the internal structure of each layer of the earth, and move to the surface of the other side of the earth. At this point, the speed of movement will continue to decrease until the crust is worn through the hole at the pole of the South Pole. After that, we will immediately embark on the way back. From the beginning of the “Vietnamese pole” to the return to the Arctic pole, the round-trip journey is about an hour and a half.
Under the premise of the most ideal conditions, the pipeline that jumped from the North Pole to the Earth’s axis of rotation crossed the Earth’s core and reached the South Pole, and immediately returned to the North Pole. The time required was about 90 minutes, roughly orbiting the Earth with the International Space Station. The time to run a circle is the same. Of course, to experience such a journey, you must remember to bring oxygen supply equipment and wear radiation protection suits!
From this we can see that it is not easy to dig through the earth and cross the earth from within. At least the current level of technology cannot be achieved, but fortunately we still have ideals.