# 5 ways to travel to the future

In film and literary works, we look forward to a highly civilized future world; we return to reality, but we lament that life is short and we cannot see what the earth will look like thousands of years later. In fact, with regard to this issue, perhaps we do not need to be discouraged now. Scientists believe that if you want to travel through time to the future world, theoretically there are five ways to achieve it.
Method 1: change the speed – speed proceeds
according to Einstein’s special theory of relativity, when an object traveling at near the speed of light, the elapsed time itself will slow down relative to the outside world. If you drive to a place at a speed close to the speed of light, you will find that you only spent a few hours on this journey, but the destination has been in space and time decades later.
In physics experiments, the researchers confirmed this bizarre reasoning.
The physicist found two atomic clocks, put one on a jet plane and the other on the ground, and then let the jet plane fly at the fastest speed for a period of time, and then compare the time of the two atomic clocks. It was found that the clock on the plane was running slightly slower than the clock on the ground. This proves that compared to the stationary ground, the time of the high-speed aircraft is slower. Although there is only a negligible time difference, the pilot of the jet aircraft has actually crossed after landing back to the ground. A little bit future.
However, with the current aviation level, no matter how fast an airplane flies, the speed of light is still out of reach, so the effect of using airplanes to achieve crossing is almost negligible. But if you are in a spacecraft that can travel at 90% of the speed of light, the time you experience will be 2.6 times slower than the time on Earth, so as you move closer to the speed of light, the probability of realizing time and space travel is also higher. Big.
This view has also been confirmed. Using the accelerator of the Large Hadron Collider, humans have moved protons to the “limit” of speed-99.9999991% of the speed of light. The researchers calculated based on the special theory of relativity that, at such a speed, 1 second for a proton is equivalent to 11 months on Earth.
However, humans still have a long way to go to accelerate an object the size of a spacecraft to speeds such as protons, but the above experiments at least prove that this is not impossible.
Method 2: Use wormhole through time and space
wormhole, also known as the Einstein – Rosen bridge, also translated as wormholes or moth holes, is connected to two different time of narrow tunnels that may exist in the universe, in 1916 by Austrian physics Ludwig Fraim proposed for the first time. In 1930, when Einstein and Nathan Rosen were studying the gravitational field equations, they assumed that through wormholes, instantaneous space transfers or time travel could be made.
So, why does wormhole get the name “wormhole” instead of “pansi hole” or “bottomless hole”?
The American astrophysicist Carl Sagan once used an analogy: Suppose there are two bugs crawling on an apple, and the bugs only have two-dimensional thinking. They only know that they are crawling on the surface of the apple in four directions, south, east, north, and west. On the ground without knowing that the apple is a ball, just like people thought the earth was flat in the past. But one of the worms accidentally dug into the apple, passed through the core of the apple, and crawled out from the other end. If the speed of the two worms is the same, the worm crawling on the surface of the apple relatively honestly can reach the same place in a shorter time because it opens the “wormhole” in the third dimension. “.
Similarly, if we open the Einstein-Rosen Bridge in high-dimensional space, then we can be like insects, without the need to travel through three-dimensional space, to reach the destination earlier.
Although there is no experimental evidence to show the real existence of wormholes, “wormhole time travel” is still only a hypothesis, but scientific progress cannot be separated from bold hypotheses.
Method 3: suspended animation, suspended animation
in the novel “three-body”, the three-body people can enter the dehydrated state of suspended animation to achieve, to get through the hellish “era of chaos”, and in normal circumstances “Hang era” wake up, continue to live ; And the earth people can enter the ultra-low temperature hibernation state, suspend most of the physiological function operation, and finally “resurrect” in the future with a healthy and young body.
The above assumptions are by no means unreasonable, nor do they have only theoretical basis. In nature, similar examples can be found. Facing the harsh living environment, the spores of bacteria can achieve suspended animation and survive for millions of years. They will not start their metabolism again until conditions such as temperature and humidity are suitable, and will recover tenaciously. Some mammals, such as bears and squirrels, also It can slow down their metabolism during hibernation, greatly reducing their demand for food and oxygen.
So, can human beings suspend life and resurrect in the future through a similar “feign death technique”?
Based on the current progress of scientific research, scientists believe that in the near future, humans can achieve short-term “hibernation”, lasting at least a few hours. These short hours of “hibernation” are of great value. It can allow critically ill patients in need of emergency treatment to arrive in the operating room and save their lives.
Method 4: The stronger the gravity, the slower time
gravity can also be a tool for crossing.
The theoretical basis of this method is also inseparable from the general theory of relativity. According to this theory, the stronger the gravity of an object, the slower the elapsed time.
If we want to let ourselves experience time much slower than the earth world in order to travel to the far future, then we need to enter a region with very strong gravity, such as a black hole. In the movie “Interstellar Crossing”, the astronaut reaches a planet near a black hole. Affected by the strong gravitational force of the black hole, the astronaut landed on the planet for just one hour, and 7 years have been spent on the earth.
However, crossing a long river of time through the gravitational field on the surface of a black hole is a very dangerous move. If you accidentally cross the boundary of the black hole, you will be pulled into the abyss by the terrible gravity of the black hole, plunged into endless darkness, and you will never escape.
Moreover, even if human science and technology can really send itself to the vicinity of the black hole, since the black hole closest to the earth is 3000 light years away, I am afraid that the long time before reaching the black hole cannot be compensated by the black hole. It can be said that the gain is not worth the loss.
In any case, it seems that the black hole traversal method is the most risky and cost-effective option, and it should be used with caution.
Method 5: Use light beams to travel through time and space
Remember the weird time machine in some cartoons that you watched as a kid? This fifth method of crossing, if it can be realized, may be such a colorful scene.
This is the beam traversal method proposed by the American physicist Ron Mallet.
Ron Mallet believes that according to the common sense of physics, time is a straight line, and everything goes along this straight line from the past to the present, and then to the future. And if space can be distorted under sufficient external force, then the straight line of time can also be distorted into a circle. In this way, it seems that we can bend the timeline arbitrarily, “Whenever we want to go, just When to go”.
Ron Mallet’s idea is to create a light-based time machine that uses a high-energy swirling cylindrical beam to activate and distort the structure of time. In theory, any object that falls into this rotating cylinder will experience a delay in space and time, so it has the opportunity to travel through time, return to the past or go to the future.
In order to raise funds to carry out research, Mallet published the theory in 2000, but his ideas did not get the approval of other scientists in the physics community, but his research continues to this day.
The above five methods of traveling through time and space have their own merits and are eye-opening. We cannot know which one of them will be realized first, or they may only stay at the theoretical stage in the end. In any case, this series of attempts, They are all big steps taken by mankind in the long march to explore the deepest secrets of the universe.