time is nothing but a magician's trick or is it we're used to time zipping along like a car always pointing into the future it creates cause and effect lining events up one after another like dominoes sometimes it stretches between moments getting so slow it might even want to stop and it's got a spotlight on right now because that's the only moment that truly matters but there's a new theory that it might not exist at all we usually think of space as having three dimensions up and down left and right forward and back and everyone thought
that time was a separate thing just a universal clock ticking away in the background and it's the same for everyone but then Einstein came forward he decided to surprise everyone back in 1905 when he introduced his special theory of relativity it said that time is another dimension just like the others and they're all tied together in one big space time based on this it turned out that time can change depending on the speed at which you move now imagine that we take two twins twin a stays on Earth twin B takes a journey into space
on a spaceship moving at a speed close to the speed of light let's say 90% of that speed twin B travels to a distant star and then returns to Earth for twin B it feels like the journey only took a few years years but when they come back to earth it turns out that twin a has aged significantly more they find out that 20 30 or even more years have passed on Earth that's all because of the phenomenon called time dilation it happens when we're reaching speeds close to the speed of light causing time to
slow down for the traveler relative to someone who stays in one place 10 years later Einstein proposed his theory of general relativity that's when we learn that time changes not only based on your speed but also based on gravity back in the day Newton thought that gravity was some Magical Force that makes objects attract each other however Einstein proposed that this isn't a force but more like an after effect picture the space as some huge cloth when you throw a heavy ball on a cloth it curves now if you throw some small balls around it
they will naturally approach the heavy ball at the same time massive objects like stars and planets cause SpaceTime to curve around them when there's something super heavy in space time it curves the matter around it this curvature tells objects how to move and this is what we call gravity this idea created all sorts of cool predictions that later turned out to be true bending of light by gravity black holes and time dilation around these black holes just like in interstellar this Theory revolutionized our view on everything but we might be on the verge of another
Revolution some philosophers have a crazy claim they say that the things we believe about time are all just ideas in our heads not facts of the physical world this idea which breaks the traditional view of time is called the block Universe it's backed up by Einstein's theory of relativity but extends it and makes it more complicated imagine the universe as a huge sandwich H the sandwich contains every moment of time past present and future all at once each layer or slice of the sandwich represents a different moment in time and all these layers exist simultaneously
rather than one after the other in this model of our world the past present and future are all equal unlike our everyday experience where the past is gone the future hasn't happened yet and only the present is real the block Universe says that every point in time is just as real as every other point imagine your birth this moment right now and what you'll be doing in 10 years from now all exist together in this block it also says there's not really a flow of time we're used to time flowing from one moment to the
next even with Einstein's theory but in the block Universe the feeling of time moving is more about how we experience and remember events than about how time itself works it's like reading a magical book all the pages exist at once but you can only experience the story Page by page now this implies some scary things like Destiny and whether free will actually exists if everything is already laid out does what we do matter for example you clicking on this video was already predetermined in the block Universe every choice you've ever made was an illusion you're
just a program following a code but with an ability to understand its consequences this would explain why we order junk food at midnight knowing that it's a bad idea that we're going to regret but some scientists argue that time's flow and direction are as real as it gets because caus and effects still exist if your birth current moment and you in the future with gray hair all existed at the same time you'd be able to visit your past self at any moment and already knew what your future self is like so this whole debate might
just be about how we piece together our stories of the past not proof that the future isn't waiting to unfold there's also a NeverEnding battle between general relativity and quantum mechanics which only adds spice to the debate on one hand general relativity plays with time like it's a stretchy Play-Doh the flow of time can stretch or compress depending on the speed or gravity on the other hand and in quantum mechanics time isn't something that can be manipulated or changed it's a constant stage upon which the particles and forces of the universe perform these two Fields
have been fighting for a long time now and scientists are struggling to unite them in one cohesive Theory of Everything although there are some candidates who try to merge them in a logical way like string theory now String Theory sounds scary but it's simply saying that the entire universe with all its particles and atoms is made up of ultra tiny vibrating strings each string can vibrate in separate ways like the strings on a guitar and in many dimensions the way these strings vibrate determines what type of particle they will be like an electron or a
quark another idea called Loop quantum gravity says that space and time are made of tiny Loops whether it's strings or Loops Unfortunately they would be so that we simply don't have strong enough equipment to check them out yet so until we test these theories they can't be proven what interesting is that both ideas don't really need time to explain how the universe works we think of things like tables and chairs as real even though physics doesn't describe them directly we say they emerge from the tiny particles that make up the universe but with time we're
not sure how it would emerge from something else but no matter what the answer is you're going to be okay if it turns out that it doesn't really exist then it could make everything feel pointless but think about this we still lead our lives and we still experience what feels like causation and Mak sense of everything it still feels like it was our choice to order that junk food at midnight so does that being predetermined really matter in any case we've been wrong about plenty of things we thought were set in stone right now there's
a big split between the block unit iverse and our traditional theories but we'll learn the truth over time that's it for today so hey if you pacified your curiosity then give the video a like and share it with your friends or if you want more just click on these videos and stay on the bright side
