They say if you put a large mirror 2 light years away from earth, people on earth could see what happened four years ago on earth.
Reason in heaven there is no aging
Nenda usome kitu inaitwa Twins Paradox utaelewa! Ama soma hii hapa chini. The easiest explanation you can give to a layman using the speed of light to demonstrate it.
Let us assume that the two brothers, nicknamed the traveler and the homebody, live in Hanover, N.H. They differ in their wanderlust but share a common desire to build a spacecraft that can achieve 0.6 times the speed of light (0.6c). After working on the spacecraft for years, they are ready to launch it, manned by the traveler, toward a star six light-years away. His craft will quickly accelerate to 0.6c. For those who are interested, it would take a little more than 100 days to reach 0.6c at an acceleration of 2g’s. Two g’s is two times the acceleration of gravity, about what one experiences on a sharp loop on roller coaster. However, if the traveler were an electron, he could be accelerated to 0.6c in a tiny fraction of a second. Hence, the time to reach 0.6c is not central to the argument. The traveler uses the length-contraction equation of special relativity to measure distance. So the star six light-years away to the homebody appears to be only 4.8 light-years away to the traveler at a speed of 0.6c. Therefore, to the traveler, the trip to the star takes only eight years (4.8/0.6), whereas the homebody calculates it taking 10 years (6.0/0.6). It is instructive to discuss how each would view his and the other?s clocks during the trip. Let?s assume that each has a very powerful telescope that enables such observation. Surprisingly, with careful use of the time it takes light to travel between the two we can explain the paradox.
Both the traveler and homebody set their clocks at zero when the traveler leaves the earth for the star (event 1). When the traveler reaches the star (event 2) his clock reads eight years. (Click here for graph.) However, when the homebody sees the traveler reach the star, the homebody?s clock reads 16 years. Why 16 years? Because, to the homebody, the craft takes 10 years to make it to the star and the light six additional years to come back to the earth showing the traveler at the star. So to the homebody, the traveler?s clock appears to be running at half the speed of his clock (8/16.)?
As the traveler reaches the star he reads his clock at eight years as mentioned, but he sees the homebody?s clock as it was six years ago (the amount of time it takes for the light from the earth to reach him), or at four years (10-6). So the traveler also views the homebody?s clock as running half the speed of his clock (4/8).
On the trip back, the homebody views the traveler?s clock going from eight years to 16 years in only four years’ time, since his clock was at 16 years when he saw the traveler leave the star and will be at 20 years when the traveler arrives back home (event 3). So the homebody now sees the traveler’s clock advance eight years in four years of his time; it is now twice as fast as his clock. On the trip back, the traveler sees the homebody?s clock advance from four to 20 years in eight years of his time. Therefore, he also sees his brother?s clock advancing at twice the speed of his. They both agree, however, that at the end of the trip the traveler?s clock reads 16 years and the homebody?s 20 years. So the traveler is four years younger. The asymmetry in the paradox is that the traveler leaves the earth?s reference frame and comes back, whereas the homebody never leaves the earth. It is also an asymmetry that the traveler and the homebody agree with the reading on the traveler?s clock at each event, but not vice versa. The traveler?s actions define the events.
The Doppler effect and relativity together explain this effect mathematically at any instant. The interested reader will find the combination of these effects discussed in The Fundamentals of Physics,by David Halliday et al. (John Wiley and Sons, 1996). Paul Davies also does a nice job explaining the Twin Paradox in his book About Time(Touchstone 1995, ppf 59.) My explanation follows Davies?s closely; I hope my graph adds further clarity. The reader should also note that the speed that an observed clock appears to run depends on whether it is traveling away from or toward the observer. The sophomore physics problem, mentioned earlier, is a special case as it applies only when the motion of the traveler passes the observer?s reference frame with no separating distance in the direction of motion.
Enyewe this kind of write ups need a blunt.
You lost me at “Nenda usome”
Are you just saying random things to mess with us?:D:D wacha ikae mtanipata motoring section comparing a vitz to a fit while taking abuses from big car owners
The concept is not for the faint minded, its too theoretical, you must be ready to think in abstract terms to understand.
Kila mtu kwa hii thread apwewe chenye anakunywa kwa bill yake.
At the speed of light you would be considered a wave rather than a particle. there exists a theory that everything is a wave with a frequency and another that supposes particles are real. Electrons often cross the boundary back and forth creating confusion as to whether it is a particle or not.
Sorry I have been very busy with work. I also wanted to add understanding the 11 dimensions are very important to grasping time-space and light-cones.
Having a fundamental knowledge of Light is very important.
Watch these videos for starters:
Carl Sagan my favourite human being has a whole beautiful 1980s TV series called the “Cosmos” you should watch this is a short clip.
https://www.youtube.com/watch?v=N0WjV6MmCyM
This is another clip I remember watching years ago and loving the subject. This is just part one, make sure you watch the whole series.
Mahali imefika itabidi mtu akipost kitu sielewi kwa hii theory nampa like tu ndio pia nikae niko in the loop
I don’t even know where to begin. I have so much to say on this.
Do not rush yourself, this stuff is not natural for the human brain to grasp. We have evolved to perceive reality in slow speeds and human scales. It took me 2 years of intense studying, bangi smoking and listening to physics audio books in matatus to get to where I am.
Whatever I say will echo the thousands of pieces you’ll find online.
Just know light (electromagnetism) is the key plus understanding nuclear bombs are a good place to start. The energy stored in each particle of little tiny mass is equal to the speed of light squared which is very incredible
Nimeanza kupata migraines niki jaribu kuelewa vitu mnaandika.Pigweni equator nyinyi wote mkavute hizo vitu zenyu mbali sana.msitupatie stress.
It simply means the Earth is Flat