Einstein's theory of relativity it's been made out to be something that's much more difficult to understand and actually is it's also not a theory it's something that is necessary for the universe as we know it to exist basically it describes that all physical properties are only in existence through the relationship objects have with other objects I'll give the example very simple one that if there are only two objects in the universe and they're getting farther apart or closer together you never know which one is moving so try to imagine that in your head only two different objects like something very basic like two spheres and they give the appearance of movement but the movement can only occur with by the relationship of the objects to each other there's only one object in the universe in you know theoretically endless void of space and they cannot move because movement can only really occur by the by its relative existence to position of other objects in space and it's the same with everything really you only really know where you are by the position of other things and even beyond things like space and position and movement time works in a very similar way and I think this is where the concept of space-time comes from the only no time by the frequency of previous events in your life you only know how long a day is because the Earth rotates around the Sun but you know a day is just it's not like a length of time that would exist if the earth did not orbit the Sun and at the exact speed that it does so I like to think of time as something that separates events and makes frequency possible frequency is just like an oscillation up and down 1 0 on and off so you only know the day by the nights you only know the positive by the negative and you only know your own existence by the existence of other things and other people so that's the basic principle behind relativity it's described very eloquently by einstein's example of saying that the speed of light is constant for all non accelerating observers to make this simple there's often the question of if you're going 99% the speed of light then what happens you know if you shine a light in front of you and thing is if you're not accelerating if you're at a consistent speed that is considered you know however many m/s is very close to the speed of light then you essentially a stationary object that's it's very hard to understand but go back to my example of if you're the only object of the universe you can't move so light if you shine a light in front of you and there's nothing to reflect it then you don't you don't see any lights so don't think that it's this esoteric hard to understand thing when you mike Hira someone proposed the idea that there's no such thing as motion there really isn't there's only faster than and slower then there's no motion that exists by itself so when you look at say there's an object in the sky and it's moving very very quickly and you suppose it's moving now 1% of speed of light that leads the speed isn't really important but with that particular object it looks to you like it's moving very quickly but from its non accelerating it's not getting any faster or slower reference frame that everything seems consistent it's you know it's kind of like the Doppler effect you hear something changing pitch only when it's moving away from you so the speed of light works in sort of a similar way I think and that you only have motion you only have a consistent speed of light when there is a a reference frame that is not accelerating what I mean by this is when you're in an ambulance you hear the pitch of the siren going off and to you it's the same thing it's unchanging except for you know the variation of pitch that is intended but for someone who's standing still someone who's not in the same reference frame as you the pitch seems to be getting higher or lower you know based on where they are in reference to the ambulance something similar happens with light when you move closer or farther away from objects if you can imagine the light hitting your eye if you're moving farther away then it's going to take a little bit longer for that to happen if you're moving closer it's going to take less time essentially adding or subtracting your own speed from the speed of light is coming off whatever object you're looking at so what would happen if you were moving nearly the speed of light away from Earth if you did this for a few days and you looked back at her through a telescope you would only see that a few seconds had passed you know depending on how close the speed of light you are but it wouldn't be nearly as much time as you had actually been traveling away so when you go back to earth the opposite effect happens if you were looking at Earth at the same time that you were traveling towards it things would seem to be moving very quickly because you are going directly into the speed of light but I don't think that you actually travel time when you do this you just you give the appearance that you do once you're out way out in space and hardly any time has passed but when you return to Earth the objects are still as they are I mean you don't want to confuse being able to see things and light as objects as they are because you know as we know Sun star might blow up and that would take us years for us to actually know that because the object giving off the light is no longer there but it's light is still because there's so much distance in between us light is still coming and hitting our telescopes
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