Time travel has been a major pillar of science fiction for decades it could actually be science in the future, because the knowledge and know-how of traveling into the future already exists, while the real challenge is to build a time machine.
The concept of the time machine is usually depicted as a bizarre invention rips through space. Scientists make it clear that a real-time machine, when built, will only be a powerful rocket and will involve space travel.
It means that time can slow down compared to those who do not move so fast. If we look at astronauts on the space station, who are in space for months and are traveling at speeds of more than 8 km per second, they are moving at speeds that are unreachable on Earth.
This means that people in the space station experience time differently than those on Earth, and would technically age a little less. When astronaut Scott Kelly returned to space after a year, the gap between him and his older, identical twin, Mark Kelly, actually became a little bigger, say scientists.
At any given time, however, everyone travels through time, in one direction and one second at a time. Time travel would mean moving into the time or the future at a higher rate, and it's possible, say experts. "In fact, we can jump as far as we want, it's all about getting really fast," said Paul Sutter, astrophysicist at Ohio State University, to Space.com via email.
Einstein's theory In the theory of special relativity, it is said that time is relative to the speed with which an object moves. "The faster you move around the room, the slower you move through time, which we've been able to measure with ultra-precise atomic clocks in jet aircraft, and the precision of the GPS system needs to take this into account. to jump in time when you only need a very large rocket, "explains Sutter.
What would happen if a ship were built that could reach much higher speeds? The magic number is 299,792,458 meters per second, or about 300,000 kilometers per second, called "c." That is not possible and nothing can travel faster than the light. However, a Popular Mechanics report talks about how time travel was actually achieved, but at a subatomic level.
"It has happened at a subatomic level," explains Ronald Mallett of the University of Connecticut. The Large Hadron Collider (LHC) – a particle accelerator – routinely sends particles into the future by bringing them close to the speed of light. Protons reach 99.999999% of the speed of light within the LHC, a speed at which the relative time moves approximately 6,900 times slower than the people observing.
How long would it take for someone to travel a thousand years into the future ? J. Richard Gott, Princeton physicist and author of the book "Time Travel in Einstein's Universe" says, "If you want to visit the Earth in the year 3000, all you have to do is get on a spaceship and go 99.995 percent of the speed The Light . "
In this case, suppose that there is a human crew capable of reaching 99.995 percent speed of light and sent on a journey into the cosmos to a nearby exoplanet 500 light-years away. At almost the speed of light, the crew would need about 500 years to get there, and another 500 years to get back, so they've covered a total of 1,000 years.
To be precise, they would return to Earth in 3018. But the crew moving so fast would not feel the same as the others on Earth. In fact, the time travelers' internal clocks would have been completely decelerated.
Her clock will tick on Earth at one-hundredth of the clock speed and she will only be about 10 years old, God explained. An entire millennium would pass for the people of Earth, but for the time-traveling crew it would only be a decade.
"If we [on Earth] looked through the window, they would eat breakfast, damn it," says God, "but until [them] everything would be normal."
But the challenge is not the science of it, but the technical feat of building a ship that can reach such speeds. The Parker Solar Probe is reportedly the fastest human-built spacecraft ever, but its top speed is a paltry .00067 percent of the speed of light.
People need to accelerate to reach almost the speed of light, but light itself does not accelerate, it only stays at that speed.
This theoretical spacecraft, which will travel to the year 3018, would take much longer than 10 years to go that far into the future, notes the report. God expects that even acceleration close to the speed of light would increase crew aging to 24 years, "but you would still be visiting Earth in 3000," says God.