Updated: Dec 1, 2020
If we think about time travelling we will think about time travel go beyond our past or future using time machine. Also we will think that we are travelling light speed and faster than one second. This can be true or not. How these can be implemented in to reality. Till now no one knows how to make it into reality. But Science says its possible. These kinds of time travel actually we see in movies,series, books only.
Then, how possible time travel ?
Time travel is possible under certain conditions and it is possible to experience time passing at a different rate than one second per second. Humans currently don't have anything for time travel and we can't hope for a time machine someone will develop future.
Many years before Albert Einstein came up with a idea known as relativity. These relativity help us a lot to understand how the time works.This theory suggested that space and time linked together, our universe have speed limit and nothing can travel faster than the speed of light i.e. 186000 miles per second. Gravity curves space and time causing the passage of time to slow down.
Then you have a question in your mind that how is this theory helping us for time travel. If we understand these theory we will get that faster we travel, we will experience slower time.
Is there any proof? Science proved these experiments. Answer is yes.
Lets take a example, take two clocks and set same time. Put that one clock in earth and keep another one in a flying aeroplane travelling in same direction that Earth clock rotates. After that the flight flew around the world and scientist compared both two clocks. The result was shocking because the clock on the aeroplane was traveling slightly slower in time than 1 second per second
Are we using time travelling in every day life?
Do you know that everyone is travelling in time for example, we are travelling one year in between birthday. Actually we are travelling in time at same speed approx one second per second. Do you know that objects including, events, explosion in space we sees through our eyes in space and telescopes, that happened a very long time ago, for example Sunlight takes 8.4 minutes reaches our planet. That means the Sun light we seeing in our eyes the light actually take place 8.4 minutes ago.
Space telescopes from different space agencies including NASA helps us a way look back at that time with the help of Space Telescopes deployed above the Earth. These Space telescopes helping us to look distant far away objects beyond the Earth in space. As we mentioned earlier that the galaxies, stars, planets we see looked that we saw is looked like very long time ago.
Now we want understand a reality that time travel is possible but we cannot goes to past or future, we cannot change them or interfere them. That kind of things happen in movies,books and animations only. The mathematics of time travel does affect the things we use every day life for example, using GPS to navigate places and reach our destination and you want to know that these GPS relies on time travel calculations and it will help you reach in your destination places.
Do you know that NASA also use high accuracy version of GPS for tracking satellites in space. The GPS satellites orbit around Earth very quickly and they were orbiting around the Earth in the speed of 8,700 miles (14,000 kilometers) per hour an this helps to slows down GPS satellite clocks by a small fraction of a second.
The satellites orbiting around the Earth 12,550 miles (20,200 km) above the surface and this actually speeds up GPS satellite clocks by a slighter larger fraction of a second. When we high up where the satellites orbit and the Earth's gravity is much weaker. This causes the clocks on GPS satellites to run faster than clocks on the ground in Earth and this is not pretty good also.
The combined result along with the earlier aeroplane, ground clocks experiment that the clocks on GPS satellites experience time at a rate slightly faster than 1 second per second and scientists can use mathematics to correct these differences in time or else there is a problem that if scientists not able to correct the GPS clocks, GPS not able to locate your position or their position. The errors would add up to few miles away in each day nd scientists correct them.
Note: This article is currently completed. Further updation will takes place in future