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Time Dilation - "Einstein's Theory of relativity" explained by fiction

 One evening in the spring of 1905 Albert Einstein, then a patent clerk in Bern, after trudging through his day's work decided to board a tram car on his way home Einstein would often wrap up his work as soon as possible to contemplate the truths of the universe in his free time It was one of these thought experiments he devised on that tram car that revolutionized modern physics forever While receding away from the Zytglogge clock tower Einstein imagined, what would happen if the tram car were receding at the speed of light He realized that if he were to travel at 186,000 miles per second the clocks hands would appear to completely freeze At the same time Einstein knew that back at the clock tower the hands would tick along at their normal pace For Einstein time had slowed down.  This thought blew his mind. Einstein concluded that the faster you move through space the slower you move through time. How is this possible? Einstein's work was heavily influenced by two of the most...
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Is time travell really possible?

Imagine you own a watch that let's you travel through time. One day, you get the bright idea to travel back to the 1920's to mess with your grandparents. You press a few buttons, and suddenly you're standing beside old Pappy who is taking in the scenery at the precipice of the Grand Canyon. Since you've never been the biggest fan of your grandfather, you decide to push him over the edge. Gravity does its thing, and a few seconds later, no more Pappy. But wait, if you killed your grandfather before he ever met your grandmother... you wouldn't have been born to be able to go back in time and kill him! Here's the problem. If you didn't exist and killed your grandfather, you couldn't have killed him... Because you didn't kill him, he's still alive. but that would mean that you yourself would be alive and now you can go back in time to kill him.  And so the endless loop goes on. This is called the Grandfather Paradox. And it's part of what makes ...
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Cosmology and the arrow of time : Sean Carroll

  Transcriber: Katarina EricsonReviewer: Denise RQ The Universe is really big. We live in a galaxy, the Milky Way Galaxy. There are about a hundred billion starsin the Milky Way Galaxy, and if you take a camera and you point itat a random part of the sky, and you just keep the shutter open, as long as your camera is attachedto the Hubble Space Telescope it will see something like this. Every one of these little blobsis a galaxy, roughly the size of our Milky Way. A hundred billion starsin each of those blobs, there are approximately a hundred billiongalaxies in the observable Universe. A hundred billion is the only numberyou need to know, the age of the Universebetween now and the Big Bang is a hundred billion in dog years (Laughter) which tells you somethingabout our place in the Universe. One thing you can do with a picturelike this is simply admire it, it's extremely beautiful,and I've often wondered what is the evolutionary pressurethat made our ancestors develop, adapt, a...
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