[r_barton]

If you are traveling the speed of light in your car and turn on the headlights, do they light up anything? ;-)

[Eddie01]

Yes.

Light emanates from its source at the speed of light regardless of the relative speed of the source.

Deal with it.

[Eddie01]

You ok?

[Quality_Not_Quantity]

If you are traveling the speed of light in your car and turn on the headlights, do they light up anything? ;-)

I don't know, but I do know that the speed of light is even faster than my kids opening the refrigerator door...

[Godebert]

"If you are traveling the speed of light in your car and turn on the headlights, do they light up anything?"

Only if you tap the brakes.

[Hot Tabasco]

If you are traveling the speed of light in your car and turn on the headlights, do they light up anything? ;-)

Of course not, nor does your horn work........

[William Tell]

r_barton said: "If you are traveling the speed of light in your car and turn on the headlights, do they light up anything? ;-)"

Basically, yes.

A real car, consisting of a certain amount of mass, would require an infinite amount of energy to attain that speed.

Slightly more realistically, let's assume that the car is traveling at 99 percent of the speed of light. Then imagine that a person at a distance in front of the car of one light year detects the light coming from the headlights.

Although the light would probably be very dim, the observer would measure the photons as having a speed of 300 million meters per second. He would also detect a pronounced blue-shift in the frequency of the light. Each photon would carry a great deal of energy; much more than would be measured by an observer moving with the car.

Finally, after 3.65 days of observing this unusual light, the observer would be run over by an extremely fast moving car.

[jpsb]

Your car can not travel at light speed. The faster you go the more massive you become, as you approach the speed of light your mass approaches infinity. So the only way to go at light speed is to have no mass. But another thing happens too. Besides gaining mass time also slows down. So let's say you are traveling along a c/2, half the speed of light. Your head lights would appear to you to be going at c because for you time was slower than for some one stationary. However the stationary observer would also see the head light light traveling at c. There is just no way to get around the universes speed limit, but it might be possible to take a short cut thru a worm hole.

Traveling at light speed is probably not a good idea anyway. Bumping your car into a clump of dust at light speed would release a huge amount of energy, similar to a small nuke.