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Is time travel possible? Five possible methods for time travel

time travel

In 2009, British physicist Stephen Hawking threw a party for time travelers. But the invitation was sent out a year later. (Guests never show up.) Time travel is impossible. However, Hawking and others Believe that when using a time machine There will be no turning back. But what is more advanced? That’s another story. In the end We are time travelers. Travel hour by hour from the past to the future. But just like the river This water flows at different speeds in different places. We know that science helps find faster ways through various methods. Here’s an overview.

Time travel via speed

This is the easiest and most effective way to achieve success: Hurry. According to Einstein’s theory of special relativity As we approach the speed of light Time is slower compared to the outside world. This is not bias or a thought experiment. However, it is something that is quantifiable. Physicists use two atomic clocks, one of which flies in a jet plane. and another stationary house on the ground. to show that the clock is running slower The level effect is small. But if you traveled in a spaceship at 90% the speed of light, you would find that the spacecraft was 2.6 times slower than Earth.

The faster you reach the light, the better. Time travel is even more difficult.

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  • Computers solved travel problems for the first time
  • Protons orbit the Large Hadron Collider at 99.9999991% of the speed of light. This may be the fastest arrival speed in human technology. in the theory of special relativity One proton second is 27,777,778 seconds, or approximately 11 months.

Interestingly, particle physicists must consider this time expansion when dealing with decaying particles. in the laboratory Muons decay in 2.2 microseconds, but fast-moving satellites, such as cosmic rays, take ten times longer to decay when they hit the upper atmosphere.

Time travel via gravity

This method of time travel was also inspired by Einstein. According to general relativity The greater the gravitational pull you feel, the stronger the gravitational pull. Time will only slow down. For example, the closer you are to the center of the earth, the The greater the force of gravity, the greater the force of gravity. Time passes faster on your feet than on your head.

Again, the effect is measurable. In 2010, physicists at the National Institute of Standards and Technology (NIST) examined two atomic clocks 33 centimeters apart and measured the large difference between the signals. Feeling a little more overwhelmed, it slowly dropped to the ground.

On a journey into the distant future We need a gravitational field as powerful as a black hole. The time to reach the event horizon is very short. But it is dangerous and you cannot escape its boundaries. However, it was not very strong. So you probably shouldn’t do that. Let’s say you have the technology to go far enough to reach a black hole. (About 3,000 light-years away), the black hole’s orbital travel time extension is likely to be much larger at any time.

(The interstellar scene, which lasts one hour around a planetary black hole, lasts seven years on Earth is Too big to be possible in space), said Kip Thorne, the film’s scientific adviser. Perhaps most surprising is that GPS systems must consider the effects of time dilation. (from the speed and gravity of the satellite) to be able to work Without these confirmations, your phone’s GPS feature won’t be able to determine your location within a few miles of the ground.

Time travel via suspended animation

time travel

Another way to travel through time is to reduce your perception of time by slowing down or stopping physical processes and restarting them later. Bacterial spores can live in suspension for millions of years until proper temperature, humidity, and food are restored for metabolism. Some mammals, such as bears and squirrels, slow down their metabolism during sleep, greatly reducing their cells’ need for food and oxygen.

Can humans do it too?

Although completely shutting down metabolism is beyond the scope of our current technology, some scientists are working to create a short-term sleep state that lasts at least a few hours. That’s enough to help someone deal with a medical emergency, such as a heart attack, before they’re hospitalized.

In 2005, US scientists demonstrated a way to reduce metabolic rate by exposing mice (non-sleep-induced mice) to small amounts of hydrogen sulfide, which binds to the same cell receptors as oxygen. The mice’s core body temperature dropped to 13°C and their metabolic rate dropped 10-fold. After six hours, the mice can be restimulated without adverse effects.

Unfortunately, similar trials in sheep and pigs have failed, and the approach may not work with larger animals. Another approach, which has been successful in pigs and is now in human clinical trials in Pittsburgh, uses cold saline instead of blood to induce cryogenic sleep.

Time travel via wormholes

General relativity also allows for paths through spacetime, called wormholes, that can accommodate a billion or more light-years or periods of varying lengths. Many physicists, including Stephen Hawking, believe that wormholes constantly move in and out at quantum scales much smaller than atoms. The trick is to grab one and blow it up at human scale. This requires a lot of energy, but is only theoretically possible. However, attempts to prove this ultimately failed due to conflicts between general relativity and quantum mechanics.

Time travel using light

Another time travel concept proposed by American physicist Ron Mallett uses a spinning beam of light to rotate space-time. In theory, anything that falls through the rotating cylinder can travel through space and time, like foam swirling on top of a coffee cup after being stirred with a spoon. According to Mallet, the right geometry could enable time travel into the past or future.

Since publishing his theory in 2000, Mallett has been trying to raise funds for a proof-of-concept experiment that uses a circular array of rotating lasers to fire neutrons. However, his ideas did not resonate with others in the physics community, who believed that one of his assumptions about the underlying model had a unique flaw and was considered “impossible” by the physics community.


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