Car as fast as the speed of light

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Discussion Overview

The discussion revolves around the hypothetical scenario of a car traveling at the speed of light and the implications of turning on its headlights. It explores concepts related to relativity and the behavior of light in extreme conditions.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant poses a question about the visual experience when turning on headlights while traveling at the speed of light.
  • Another participant argues that the premise of a car moving at the speed of light contradicts the principles of relativity, suggesting that the question is fundamentally flawed.
  • A further clarification is offered regarding a scenario where the car travels at 99.9% the speed of light, stating that light would still travel away from the car at the speed of light, similar to any speed below light speed.

Areas of Agreement / Disagreement

Participants do not reach a consensus, as there is disagreement on the validity of the initial question and the implications of relativity in this context.

Contextual Notes

The discussion highlights limitations in the assumptions made about traveling at light speed and the dependence on the framework of relativity for interpreting the scenario.

mildpiranha
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What would happen if you drove a car as fast as the speed of light and then switched on the headlights
 
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"[URL am driving my car at the speed of light and I turn on my headlights. What do I see?
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Because you cannot have a car moving at the speed of light, you are asking a question that basically says "Assuming relativity does not hold, what would relativity say happens"- it just doesn't make sense.

You can ask, "suppose I am in a car traveling (relative to some frame of reference) 99.9% the speed of light, what would I see?" You would see, of course, light traveling away from you at the speed of light and, if it reflected from some object, coming back to you at the speed of light, exactly as you would moving at any speed below that of light.
 

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