It is possible to travel in time but the construction time machine is still difficult to reach



  Time travel

The science of time travel is strong, but the technology to achieve it is not here yet. Representational image Creative Commons

Time travel has been a pillar of science fiction for decades, but it could be a real science in the future since the knowledge and knowledge of traveling to the future already exists, while the real challenge is to build a time machine.

The concept of the time machine is usually represented as a strange contraption that rips through space. The scientists clarify that a machine in real time, if it is built, will be a powerful rocket and will involve space travel.

It means moving really fast could make time decrease with respect to those who do not move so fast. Consider the astronauts on the space station who spend months in space, traveling constantly at speeds of more than 8 km per second, moving at speeds that might not be achievable on Earth. That means that humans on the space station are experiencing time differently than those on earth and technically they would age a little less. When astronaut Scott Kelly returned after a year in space, the gap between him and his identical twin, Mark Kelly, actually widened a bit, scientists say.

At any given point, everyone travels through time, though, in one direction and one second at a time. Time travel would mean moving forward in time, or in the future at a rate higher than that, and it is possible, experts say. "In fact, we can jump into the future as much as we want, it's just a matter of going very, very fast," Paul Sutter, an astrophysicist at Ohio State University, told Space.com by email.

Einstein's theory in special relativity, says that time is relative to the speed at which an object moves. "The faster you move through space, the slower you move through time, we have been able to measure this with ultra-accurate atomic clocks in jet planes, and the accuracy offered by the GPS system must take this into account." He always seems to need complicated gadgets to jump in time, when all you need is a very large rocket, "explains Sutter.

What would happen if you built a ship capable of much higher speeds? The magic number is 299,792,458 m per second, or approximately 300,000 km per second, denoted as "c." That is not possible to achieve and nothing can travel faster than light, having said that, a report by Popular Mechanics talks about how travel has actually been accomplished in time. , but at subatomic levels.

"At the subatomic level, it has already been done," explains Ronald Mallett of the University of Connecticut The Large Hadron Collider (LHC) – a particle accelerator, routinely sends particles to the future taking them at a speed close to that of light. Protons reach 99.999999 percent of the speed of light within the LHC, a rate at which their relative time compared to humans makes observations move about 6,900 times slower.

So, how long would someone take? travel a thousand years in the future ? J. Richard Gott, Princeton physicist and author of the book "Time travel in the Universe of Einstein" says: "If you want to visit the Earth in the year 3000, all you have to do is get on a spaceship and get there to 99.995 percent of the speed of light. "

In this case, let's suppose that there is a human crew that is capable of reaching 99.995 percent of the speed of light and that they are sent on a trip to the We cosmos a nearby exoplanet that is treated 500 light years away. Almost at the speed of light, the crew will take about 500 years to arrive and another 500 to return, so they have traveled 1,000 years in total.

To be precise, they would be returning to Earth in the year 3018. But the crew that moves so fast would not feel the same as for the rest of the Earth. In fact, the internal clocks of time travelers would have slowed down completely.

Your watch will be operating at 1/100 of the speed of clocks on Earth and will only age about 10 years, Gott explained. A whole millennium would go by for humans on Earth, but for the crew that travels in time, it would only be a decade.

"If we [on Earth] were looking out the window, they would be eating veeeerrry slooooowly" says Gott, "But for [them] everything would be normal."

The challenge, however, is not the science of that, but the engineering feat of building a ship that can reach such speeds. According to reports, Parker Solar Probe is the fastest spacecraft ever built by humans, but its maximum speed is negligible .00067 percent of the speed of light.

Humans need to accelerate to reach near-light speed, but the light itself does not accelerate, it just keeps at that speed.

This theoretical spacecraft that will travel to the year 3018 would actually take much more than 10 years to get that far in the future, the report said. Gott estimates that constant acceleration up to near the speed of light would actually increase the aging of the crew to 24 years, "but you could still visit the Earth in 3000," says Gott.

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