Relativity - Chapter 3 of 6
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@LeconsdAnalyse So basically spacial contraction doesn't apply to light? That's good to know. Thanks for answering. That helps a lot.
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@winsomemastix SORRY, i made a mistake in my previous remarks....
You are correct in that, L`=L/γ=L√(1-v²/c²)→0 as v→c-.
However, the `Lorentz factor` (γ) applies to a moving MATERIAL object which, according to SR, can`t ever reach speed equal to `c`.
When speaking about the universe (cosmology) GR (not SR) is implied. Of course, SR still applies but within small neighborhoods about the (majority of) points of GR-spacetime.
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If you reach the speed of light, how much does space contract? Does distance become zero? If So, why doesn't light cross the universe instantly?
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sigh - klingons have disruptors- not lasers
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@CogitoErgoCogitoSum If the stationary observer must see the beam traveling in the reverse direction at light speed then, okay. But the distance spanned from the moving ship would increase much faster. Wouldnt the perspective from the ship be much different than what relativity would suggest, at least in casseopeia's example of how it works
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Hmm, I wonder if we could measure the speed of light accurately enough if we could use it as a standard of measure.
The speed of light is near 300000 kilometers, why not change the kilmoeter until it is exatley 300000 kilometers per second.
I just thought it might make equations in physics would be better if we used something not physical to set a measure of distance. Planck units, or the speed of light, or The wave length of a particular frequaency of light.
Silentsam7532 8 months ago
@Silentsam7532 Something similar to what you describe is used in science all the time. It is called the system of natural units. In this system the speed of light (as well as the value of other physical constants) is set equal to one.
It is also true that the current definition of a meter DOES involve the speed of light. One meter is equal to the distance light travels in a vacuum in a time interval of 1/299,792,458 of a second.
cassiopeiaproject 8 months ago