7 ms·
Makes me think of this : https://en.m.wikipedia.org/wiki/Terrell_rotation https://en.m.wikipedia.org/wiki/Terrell_rotation How when going at relativistic speed
by dmbche 3y ago
Makes me think of this : https://en.m.wikipedia.org/wiki/Terrell_rotation https://en.m.wikipedia.org/wiki/Terrell_rotation
How when going at relativistic speeds, you start to appear to rotate to obervers even if you are going straight - you can even see behind the object!
- brabel 3y agoThat's amazing. I've watched lots of videos about length contraction and I don't think any of them ever mentioned this (the shape of an object moving a near light speed won't change to an observer, it will just appear as if it had rotated instead of being "squeezed" as every video about this seems to imply)!
- rand0mx1 3y agoThis video might change your perceptive. https://youtu.be/watch?v=uTyAI1LbdgA https://youtu.be/watch?v=uTyAI1LbdgA
- MayeulC 3y agoYou rather showed the opposite. While interesting, this video only explains length contraction, not the Terrell–Penrose effect. In this video, the passing spaceship would appear to be rotated to the observer, not just contracted, as, to quote Penrose via Wikipedia, the light from the trailing part reaches the observer from behind the [spaceship], which it can do since the [spaceship] is continuously moving out of its way"
- ricksunny 3y agoThis nascent series on YouTube , Hypercubist Math, sets out to make four dimensions intuitive to our three-dimensions-accustomed brains. Baseline is just basic calculus, which the inaugural video provides in context: https://youtu.be/XfWgfZ5V2qI https://youtu.be/XfWgfZ5V2qI
- someplaceguy 3y agoMan, the universe is weird... Whoever created it was not a fan of the KISS principle.
- combat-banana 3y agoIt’s very simple depending upon your context. (God’s object)
- rakoo 3y agoOr, they just set the speed of light as a #define and left the rest as undefined behaviour
- hn_throwaway_99 3y agoPerhaps nit picky, and I know you were joking, but I think this is the wrong way to think about it. It's not that the other behavior is undefined, it's you essentially have all of these functions that use "C" in their definitions, and then you have "#define C ..." in a header file somewhere.
- ilyt 3y agoJust look at near any 30+ years long programming project and then extrapolate the growth of complexity and weirdness into billions of years
- wheelerof4te 3y agoSpaghetti code? Try "The Big Bang code".
- russdill 3y agoA limit to the speed of causality makes physics so much simpler. Without it you'd need to factor in the interaction of every particle with every other particle in the universe.
- someplaceguy 3y ago
- vikingerik 3y agoTook me a minute to wrap my head around it, that explanation isn't worded that clearly, but then I got it. That happens because time is a factor in how light from different parts of the object will reach the observer. Light from its far side takes longer and in that time the object continues to move. You can see behind the object, because its rear end moves out of the way of the light coming from itself during the travel time of that light.
- idonotknowwhy 3y agoHow does the rear end move out of the way? Wouldn't it be blocking the light? It's not like the object could move out of the way faster than the speed the light it traveling at (ftl)
- consilient 3y ago> It's not like the object could move out of the way faster than the speed the light it traveling at (ftl) It doesn't need to move as far as the light does.
- __blockcipher__ 3y ago(Not GP) Thank you, that made it click for me!
- h1fra 3y agoReminds me of this video https://www.youtube.com/watch?v=ge_j31Yx_yk https://www.youtube.com/watch?v=ge_j31Yx_yk explaining the Terrel rotation (and other effects) in a video game engine.
- JdeBP 3y agoI have this vague memory that Carl Sagan did similar in _Cosmos_, with motorcycles.