Is time travel possible in 2022? The fact is that everyone travels in time every day at the same speed; That is, one second per second. But what about the past? Is it possible to return to it?
NASA space telescopes give us a way to look into the past; These huge machines help us see stars and galaxies that are very far away.
Is time travel possible in 2022?
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Light from distant galaxies takes a long time to reach us. So, when we look at the sky with a telescope, we see what those stars and galaxies looked like a very long time ago, according to Space.com.
However, when we think of the phrase “time travel”, we usually think of travel faster than one second per second. This kind of travel feels like a script for a movie or a science fiction book.
Could it be real? Science says yes!
But before we review the applicability of the matter scientifically, the physicist Stephen Hawking said in his book “Black Holes and Small Worlds”: “The best evidence that time travel is not possible, and never will be, is that the Earth has not been invaded by hordes of tourists from the future”.
But this answer rejecting this idea is countered by an opposite theory, albeit within limits.
More than 100 years ago, Albert Einstein came up with a theory about how time works; He called it the theory of relativity.
This theory says that space and time are linked together. Einstein also said that the universe has an upper limit of speed; Nothing can travel faster than the speed of light.
Einstein’s theory holds that gravity bends space and time, causing time to slow down
How does this theory relate to time travel?
According to this theory, the faster you travel, the slower time goes.
Scientists conducted some experiments to prove this is true.
For example, in one experiment two clocks set at the exact same time were used. One of the watches stayed on the ground, while the other flew in an airplane (it’s moving in the same direction as the Earth rotates).
After the plane flew around the world, scientists compared the two watches. The clock on the plane was slightly behind the clock on the ground.
Therefore, a watch that was on the plane is traveling (traveling) in time slower than one second per second.
Can we use time travel in everyday life?
A time machine cannot be used to travel hundreds of years into the past or the future. This kind of travel only happens in books and movies. But the computation of time travel affects the things we use every day.
For example, we use GPS satellites to help us know how to get to new places.
NASA scientists also use a high-resolution version of the Global Positioning System (GPS) to track the whereabouts of satellites in space. But did you know that GPS relies on time travel calculations to help users get around the city?
GPS satellites orbit the Earth at 14,000 kilometers per hour.
This slows satellite clocks down by a fraction of a second, similar to the aircraft example above.
However, the satellites also orbit the Earth at an altitude of about 20,200 km above the surface.
This actually speeds up GPS satellite clocks by a fraction of a second.
The US space agency, NASA, or NASA explains the method as follows:
Einstein’s theory is that gravity bends space and time, causing time to slow down.
At a high altitude where the satellites orbit, Earth’s gravity is weaker, which causes clocks on GPS satellites to run faster than clocks on Earth.
The combined result is that clocks on GPS satellites experience time passing a little faster than one second per second.
Fortunately, scientists can use mathematics to correct for these time differences.
If scientists do not correct the GPS clocks, there will be huge problems, the GPS satellites will not be able to correctly calculate their location or the location of the user.
Mistakes may add a few kilometers each day, which is a big problem; Maps will not be able to pinpoint exact locations.
Yes, time travel is indeed a real thing, but not as portrayed in movies and science fiction literature.
Under certain conditions and not available to everyone, it is possible to experience time passing at a rate slightly different than one second per second.