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Then the theory of relativity came and explained the cause of the failure. Electric action requires time to travel from one point of space to another, the simplest instance of this being the finite speed of travel of light... Thus electromagnetic action may be said to travel through space and time jointly. But by filling space and space alone [excluding time] with an ether, the pictorial representations had all supposed a clear-cut distinction between space and time.

James Jeans#7

TimeLightSpace

About this quote

What does it mean?
Relativity showed space and time work together unlike old ether theories. Electric action needs time.
In plain terms
Light takes time to travel so space and time are linked not separate.
What can you take from it?
Space and time are connected not independent.

Where it applies

  • physics study
  • understanding light
  • theoretical physics

Putting it to work

  • think in spacetime
  • determine separation

Questions to consider

  • How does linking space and time change things?
  • What old pictures mislead us?

Another view

Ether was a useful pictorial model even if wrong.

More from James Jeans

  1. Faraday, Maxwell, Larmor and a great number of others tried to explain electromagnetic action on these lines, but all attempts failed, and it began to seem imp…

    Permalink to quote #6
  2. ...when the experiment was attempted by Michelson and Morley it failed, thus showing that space and time assumed in the picture were not true to the facts of n…

    Permalink to quote #8
  3. At this time, space was supposed to be filled with an ether, a substance which might well serve, among other functions, to transmit forces across space. So lon…

    Permalink to quote #5

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