Black Holes and Time Travel

Black Hole

 

Time travel is always an interesting topic to discuss. Being able to switch between the past, the present and the future is not a just fiction that was created by the mere imagination of writers and movie makers but is a theory that was developed by great scientists like Albert Einstein and Stephen Hawking. Till date, there is no such device called a time machine. But there are theories that actually state that time travel is possible. Let us take a closer look.

Time Travel

To understand time travel it is essential to know about two things called space-time and black holes.

  • Spacetime: Time is always considered to be an independent variable that keeps flowing continuously irrespective of the change in anything around it. But according to the theory of relativity, the flow of time varies at different points of space. The flow of time in earth need not be same as the flow of time in various points on space. Time varies along space like the variation of temperature at different points on earth. So time is considered as a dependent variable in this theory and it is said to depend on its location in space. Space is considered as a variable with three dimensions called length, width and height. But space-time is a variable that has four dimensions which have time as the fourth dimension. In the theory of relativity, space-time is used to calculate the variation of time at different points in space.

 

  • Black Holes: The black holes are not actually holes. They are heavenly bodies like planets that have incredibly high gravity. Gravity on earth pulls the earthly objects towards earth and prevents them from escaping to space. In the same way, the high gravity of the black holes pulls everything that passes across it in such a way that even the photons in the light waves are not allowed to escape. An object is visible to you only when your eyes see the photos bouncing off it. As the photons are pulled towards the black holes and are not allowed to bounce off, they become invisible in space. This is the reason why they appear dark and look like a black hole in space, hence the name.

black-hole-time-travel-power
Source

Bottom line: The time flow on earth is different from the time flow near a black hole. If you can travel to a black hole, you can actually travel time. The next section of this article will explain this with better clarity.

Time travel theories

According to toStephen Hawking, “if you can spend a few years near a black hole, it is actually more years on earth”. According to Einstein, “if you can travel faster than the speed of light you can actually travel time”. Now by merging the two theories, we get a reasonable solution.

time-travel-black-hole
Source

According to Stephen hawking, you can travel time by living near a black hole. Light is found to be the fastest thing in the universe but if a black hole can pull light into it then living near a black hole is possible only if something can travel fast enough to resist that gravity i.e. much faster than light. So both the theories of Einstein and Stephen Hawking merge at this point. To travel time one has to survive near a black hole (Hawking). To survive near a black hole, one has to resist the gravity of black hole. To resist the gravity of the black hole, one has to travel much faster than light (Einstein). So, the conclusion is, “if you can travel in a device that can travel fast enough to survive near a black hole, you can travel time”.

The relationship between velocity and time:

We know that velocity (V)=distance (L) / time (T)

So change in velocity = change in distance/change in time

i.e. dV=dL/dT

or dT = dL/dV

This means the change in time depends on up on the change in velocity and change in distance. If you can change the velocity up to a certain level, you can actually control time. But this velocity has to be really really fast (much faster than the speed of light).

Earth_to_Sun
Source

Fact: Light travels around the equator of earth seven times in a second. It takes about 8 minutes for light to travel from the sun to earth. Light is observed to be the fastest thing in universe ever.

 

Tags: Mass–energy equivalence , Micro black hole , A Brief History of Time , Black holes , Theory of relativity , Physics , Galaxies , Time travel , Hypothetical astronomical objects , Albert Einstein , Faster-than-light , Gravity

Latest Articles


Playing games in one of the biggest hobbies of people. Doing what you want in the Virtual world has more fans than you expect. Multiplayer takes the fun a bit higher as you can…

  The constant pursuit of Hollywood to adapt novels, games, and stories is presently very high. This time the crosshairs of Hollywood is on the phenomenal hit series, Witcher.…

Google made a lot of promises. Some were brought to life, some were scraped off. But there is one thing that Google will never disappoint users. It is Android. The tech giant…

  Messi is regarded as the magician with the ball. He is undoubtedly, one of the greatest players to have ever graced the game. The ball sticks like a magnet to his feet and…

  Have you ever dreamed of traveling a place without leaving your home? Ever thought of doing something very dangerous without getting hurt? Then you must have already tried…

Have you ever dreamt of jogging down to your nearest supermarket, buy the things and reach home? That too without any queues, checking out counters and most importantly paying at…

  Does your heart skip a beat every time you go up on the stage? Do you forget your speech and allow your mind to go blank? Do you feel nauseated when you look at the audience…

  The hustle and bustle of Premier League is not everyone’s cup of tea. It requires lots of hard work and dedication and requires everyone to be at their top each day. It is the…

  KXIP had a rather depressing last two outings in the IPL. They have performed inconsistently and paid the compensation for that, by getting placed at the last place. Their…

Google, the tech giant expanded at a greater rate since its inception as a school project. The company is known for its search engine and other software products also had a hand…

  In the recent past, Juventus has turned out to be one of the biggest clubs in the Europe circuit. It was not long ago, that they were relegated to the second tier of the…

  Wrestlemania was an event that was aimed at the diehard WWE fans. It consisted of dream matches that would never happen otherwise. Wrestlemania is painted as the dream of every…

For most people out there in India, or for that matter in any part of the world, it’s a difficult thing to save money. There are many things which can be done by anybody wanting…

  Microsoft's Windows 10 is the best operating system for business and educational applications. Microsoft is always considered a minor player when it comes to designing and…

  Google defines satire as the use of humor, irony, and exaggeration to expose some vices in the context of contemporary politics or other topical issues. Not since Chandler…

  If there is one company that we can look out when coming to Photography related apps or technologies, Adobe Systems is the one. With always being one step forward in this area…

  The former Indian captain has not been in the best of forms lately. M.S Dhoni has built a reputation for himself of being the best finisher in the world. Lately, he has been…

  Smartphones are changing daily. With new additions and more requirements, the companies are going a long way to making their smartphones unique and more powerful. The bigger…