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quote:n physics, a magnetic field is the relativistic part of an electric field, as Einstein explained in 1905. When an electric charge is moving from the perspective of an observer, the electric field of this charge due to space contraction is no longer seen by the observer as spherically symmetric due to non-radial time dilation, and it must be computed using the Lorentz transformations. One of the products of these transformations is the part of the electric field which only acts on moving charges - and we call it the "magnetic field".
quote:Originally posted by thebrain13yes you can say that distance is relative to how far(notice far is another term for distance)light from krypton-86 in vacuo travels given a specific duration of time. however lets say that light from krypton-86 takes eight minutes to reach the sun. There are no platinum bars in empty space to set the speed of krypton relative to, so why does it take that specific length of time to complete the trip. The answer is there are eight light minutes of space between the sun and the earth. you must traverse a billion light years to reach a distant galaxy, you must traverse eight light minutes to reach the sun. but what exactly is it that is so different about the sun and the distant galaxy, that makes light take more time?
quote:Originally posted by NieuwenhovePersonally, I believe that at the smallest level, space itself is not continuous but discrete and looks like some complicated net-structure with nodes connected by links. These links have no length themselves but it is the number of links between two separated nodes which can be considered as a length. Compare it for instance with internet connections. When site A is 6 clicks away from site B, the "distance" is 6. Distance defined in this way is a dimensionless number, which is very good. For more details see : http://home.online.no/~avannieu/darkmatter/
quote:Originally posted by NieuwenhoveHi,"Merely the difference in location" is not a good definition as location itself is not defined. Of course, you can define location again with using distance but then one has a circular argument. When the intermediate nodes are there one has no longer a problem. A number is a number, is absolute and defined.
quote:Originally posted by thebrain13I was wondering, what exactly distance is.