If you are driving at the speed of light and you turn your headlights on, what happens?
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you continue to see the light as "normal"
relativity sets the speed of light as the same no matter how fast you are going. If you throw a ball at the speed of light, the ball moves forward at the same relative speed as if you were standing still and the same is true of light.
Thing is though, you can't ACTUALLY go the speed of light so you are talking about .99999999 times the speed of light.
"As you approach the speed of light with your headlights on, however, you would still measure the light beam racing away from your car at 186,000 miles per second (c). A "stationary" observer watching this happen, though, would not then measure the beam's speed at almost twice c. Relativity says that all observers always get the same measurement for c.
While that may not sound logical or plausible, it happens because what we normally think of as fixed concepts--length and time--are both variable at high speeds. If you observed a car travelling past you at close to c, its length in the direction of travel would appear shortened and the passage of time on board would appear slowed down."
Thing is though, you can't ACTUALLY go the speed of light so you are talking about .99999999 times the speed of light.
"As you approach the speed of light with your headlights on, however, you would still measure the light beam racing away from your car at 186,000 miles per second (c). A "stationary" observer watching this happen, though, would not then measure the beam's speed at almost twice c. Relativity says that all observers always get the same measurement for c.
While that may not sound logical or plausible, it happens because what we normally think of as fixed concepts--length and time--are both variable at high speeds. If you observed a car travelling past you at close to c, its length in the direction of travel would appear shortened and the passage of time on board would appear slowed down."
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