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2,678,662 Views ⢠Apr 8, 2023 ⢠Click to toggle off description
Take the quiz to see if you understood everything: quizwithit.com/start_thequiz/1687737623494x5754962âŚ
If you've been following my channel for a really long time, you might remember that some years ago I made a video about whether faster-than-light travel is possible. I was trying to explain why the arguments saying it's impossible are inconclusive and we shouldn't throw out the possibility too quickly, but I'm afraid I didn't make my case very well. This video is a second attempt. Hopefully this time it'll come across more clearly!
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00:00 Intro
01:51 The Speed of Light as Limit
06:12 The Speed of Light as Barrier
12:44 Time Travel Paradoxes
20:47 Quantum Gravity and Summary
21:54 Learn Physics on Brilliant
#science #physics
Views : 2,678,662
Genre: Science & Technology
Date of upload: Apr 8, 2023 ^^
Rating : 4.897 (2,383/89,965 LTDR)
RYD date created : 2024-05-15T20:31:20.36046Z
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YouTube Comments - 12,424 Comments
Top Comments of this video!! :3
The thing I love about this channel is half the time it doesn't feel like a youtube channel, or even a documentary channel, it just feels like a professor's mid-lecture ramblings that they spend half the class talking about because they're just so damn interested in it they completely lose track of the discussion and if you ask me, those are the best ways to learn.
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Clicked on this one faster than speed of light.
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I really appreciate your pause in discussion at around 18 minutes to recap the present topic. You knew right when my head was starting to lag while absorbing this information. Phenomenal teaching.
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8:20 Youâre almost entirely made of Pure Energy. Though when I see how much time you spend watching YouTube I find that hard to believe.
My new favourite quote.
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âHey, we donât serve faster-than-light particles in here.â
A tachyon walks into a bar.
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Hi All, I realized too late I should have added a word about quantum mechanics: Quantum mechanics has the same speed limit (barrier!) as special relativity, and special relativity is where this barrier comes from. Therefore, quantum physics doesn't change anything about what I explained here. (Which is why I forgot to even mention it...)
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I do not know why youtube decided to start putting these videos in my feed. But I am loving them. She does an excellent job of explaining things in a way I can follow. Great channel!
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Sabine, this is fantastic and funny. I'm not sure I could answer any of the quiz questions... but I will watch you again. This presentation is crazy cool.
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"if you live in the USA, make that 20"
as someone who commutes by train, I felt that.
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There was a time-traveller named Wright who travelled much faster than light. He set off one day in a relative way, and arrived on the previous night.
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Love this channel and Sabine's explanations, even of stuff I already know. Keep up the good work !!
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The Lorentz transformations for speed, mass and length go totally nutty as v approaches c which is why you cannot travel AT the speed of light because your mass tends to infinity, so the kinetic energy you need also tends to infinity.. However those same formula say once v > c that mass drops sharply back away from infinity.. What this implies is it could be feasible for particles to tunnel from below light speed to above lightspeed, the same way electrons tunnel through impossible voltage gradients in Zenner diodes.
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Not understanding physics has been a drag all my life. For instance, I've been all into plate tectonics theory since the late 60s, and while I seemed to excel at logic, physics was a brick wall halting my ability to explain and argue my reasoning. That brick wall (my thick skull - or being lefthanded -according to teachers and parents) later interfered with my passion for studying oceanography and geology as deeply as I wanted to in the 80s and 90s. So my college degrees were light om math studies. I'm telling you this because watching your videos, the way you describe and explain things led me to discover how physics works. I can now say, at 74 years old, that I get it!!! I'm so grateful, thank you!
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Isnât speed always infinite from the perspective of the photon? Like, a photon from the early universe might take 13 billion years to reach us from our viewpointâ but from the photonâs view, the journey is instantaneous. Thus, our perception of âspeedâ (distance over time) is just an artifact of our motion experience.
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Thank you for covering that supposed ftl time travel paradox. I never understood the argument. I could follow it, but it never made any sense to me how bob's perception of something traveling backwards in time could somehow be used to give his past-self a message. I'd always assumed that I just couldn't grasp what was actually going on, or that I was missing something. You've renewed some confidence in my own intelligence.
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This is something that has always fascinated me because I've always wondered if we would even be ABLE to see something that was travelling faster than the speed of light...
I read up on the subject as best I could, and explanation goes along the lines of:
It wouldn't become scientifically âinvisibleâ, but stationary beings would not be able to see something travelling faster than light because light wouldn't have time to reflect off it and into your eyes.
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Thank you for having a full transcript for the close captions. You have no idea how much I appreciate. So many channels don't, so the subtitles aren't accurate, or maybe they don't even have any. I have auditory processing disorder, so I have issues understanding talking sometimes.
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This is the most awesome mixture of super high quality information and super dry super funny humor you can experience in this and all 6 parallel univeses. I love the style of Sabine đ
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I came here for the science and stayed for the dry German humor. 10/10
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@SabineHossenfelder
7 months ago
This video comes with a quiz which you can take here: quizwithit.com/start_thequiz/1687737623494x5754962âŚ
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