Is Time Travel Possible? | The Science of Doctor Who | Doctor Who

19 thoughts on “Is Time Travel Possible? | The Science of Doctor Who | Doctor Who”

1. the past and the future are the same thing……..

2. This guy used to be a real scientist. Now he's just a TV celeb and he doesn't even keep up to date with the physics journals (and it shows). He has a somewhat blinkered attitude to new ideas and his mind is closed to anything that departs from what he learned as a student.

3. "It's life, Jim, but not as we know it"

4. You have just Asserted my Question thank you Happy Days 😊

5. Iv got Question…? Is Time and Space and 299792458 only relative to Us

6. Great, according to him you can't time travel past but you can travel future, my question is , will you get stuck in future once travelled?😂, Coze' you can't travel past ryt?😂

7. Time travel is at the core of the sci-fi novel "Changing History" by Marco Lemessi, on sale on Amazon

8. Yes but I don't get how you can travel into the future where would u go ?

9. All you guys still have not yet been able to understand that the concept of time was invented by human beings to interpret what human limited knowledge can observe, but it never ever exists anywhere else in the universe other than within human limited knowledge
   Human invented concepts of time and space are actually the same form of existence, but not two separate different forms of existence as fundamentally misunderstood . The concept of time originated in the Earth's motion around its axis and the Sun. So if the Earth's rotation around its axis and movement around the Sun stopped , or the Sun's fusion reactions stopped, human invented concept of time would no longer exist to help human limited knowledge understand and distinguish changes of physical structures and positions of forms of matter or existence observable to human limited knowledgeI on thus planet and elsewhere in the universe, therefore such human subjective interpretations or concepts of the past , the present and the future would no longer work
   You guys should already have noticed that you guys can apply human concept of time only when there is a progress of the effects of sunlight on the Earth's surface, and the Sun does not move around the Earth , and such effects of sunlight is created by the Earth's rotation around its axis, and the changes of the Earth's physical structure and all other forms of existence on it are the results of the Earth's motion around its axis and the Sun.
   Since human concept of time originated in the Earth's endless rotation around its axis and movement around the Sun, the flow of time is actually the Earth's endless motion, and all the changes of physical structures and positions in space of all forms of existence observable to human beings are defined by the Earth's motion
   For example, human concept of the speed of light is totally based on the Earth's motion, because without such units of time corresponding to the progress of the Earth's states of positions rotating around its axis within a complete cycle of sunlight and darkness, there would never ever have been such human conce of ts of speed
   A day is corresponding to a complete rotation of the Earth's around its axis, and a complete rotation around its axis is corresponding to its largest circumference on the equator , and the circumstance is equal to a distance or a length is space, and is arbitrarily divided into 24 parts corresponding to 24 hours , and each small part of the circumstance is arbitrarily divided into 60 smaller parts corresponding to minutes , then each smaller part is divided into even smaller parts corresponding to seconds which means the concepts of hour , minute and seconds are actually about the changes of the Earth's positions in space within a complete cycle of sunlight and darkness , and the changes of the Earth's positions within a revolution around the Sun created by its rotation around its axis. So when it is said that it takes you 5 hours to go from one location to another location , it means that the length of time of your motion is corresponding to the progress of the Earth's motion around its axis which it has made is about 5/24 of the distance which its complete rotation makes or 5/24 of a complete cycle of sunlight and darkness. It means that without the Earth's motion, such human concepts as speed of a car, a train, a plane , light and etc would no longer exist
   1 light year means the speed of light within the continuation of the Earth's motion around the Sun will create a distance which is based on the distance made by the earth around the Sun within a complete revolution
   The speed of an object can be defined only when it is based on the Earth's motion on which human limited knowledge invented the concept of time
   Example : in the expression" 1000 m per second ", if the unit of time "second, " is omitted, it would no longer describe any sort of motion of any object or form of existence, and without the units of time , there would no longer be any way to measure any distance made by a motion of an object or a form of existence
   So the idea that time can travel is nothing new while time is actually the endless motion of the Earth around its axis and the Sun, and it is no surprise either that the idea that 5 years on this planet can be more than 5 years or less than 5 years , say 9 years on another planet or somewhere in space within the solar system , while human concept of time can be applicable only when there is still the Earth's motion and the effects of sunlight on it's surface., in other words human concept of time is valid only when the frame of reference is here on this planet
   Since all the changes of the Earth and all forms of existence on its surface are the result of its motion around its axis and the Sun, it is not any surprise either if a hunan or a form of existence on this planet can last or live longer somewhere else within the solar systen where there is such an living enviroment as that on this planet
   The idea that you can travel to the future, however, is completely nonsense, even if you could travel as fast as the speed of light, simply because human concept of time can be valid or applicable only when it abides by the Earth's motion and the influence of the effects of sunlight on its surface which are never decided nor can ever be changed by human beings nor by any other form of existence. The endless sequence of the flow of time is the very endless motion of the Earth around its axis and the Sun, and human concept of future here is always bounded within the changes of the Earth's position and the changes of physical structures of all forms of existence on its surface , but not anything anywhere else
   Since such changes of positions and physical structures of the Earth and all the beings on it are irreversible , the idea that you can travek back to the past in time is also absurd and nonsensical
   The reaason why the human concept of time has only one and irreversible direction in human-iinvented concept of direction is that, the Earth's motion can never be reversed to the opposite way
   All such human wild imagination or subjective interpretations as Einstein's theories are only valid within human limited knowledge and wild imagination, but never ever exist anywhere else in the universe

10. the light exposure of the aliens (or us in future) needs to be lowered a bit to be more true.

11. So captain kirks 5 year mission took 29 years

12. You would think Brian would have more sense wouldn't you really?

13. Is time travel possible? Certainly not for humans in our current form with our current knowledge of the laws of physics in the universe as we currently find it.

14. I bet Brian wishes he could turn back the clock ~ and stop BREXIT. But he can't.

15. Time being a personal experience makes time travel into the future an impossible phenomenon. You want to see who your country's president will be after 100years. Are you crazy 🤪

16. Not that anyone cares but I did the maths and I think he meant 94% the speed of light cus of it was 99.94%, 289 years would have passed. Anyways, carry on

17. Am simply blown away by this explanation. And as always, the most complicated things have the simplest of solutions. No wonder he's the Rockstar of Physics. Wish I could sit at his feet and learn from him on a daily basis.

18. My english is not good 😫😫

19. This is SO annoying. What Brian was describing is NOT time travel, but time dilation. It's just like putting some food in the fridge so it'll last longer.

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