What happens if you are in a car going the speed of light and you turn your headlights on?

Answer 1

I could answer that, but then I'd be forever labeled a geek, so, no.

I mean, DUDE! STEVEN WRIGHT SO ROCKS!

Answer 2

First of all, it is not possible to travel at the speed of light (abbreviated c) because that would require an infinite amount of energy.

Let us suppose instead that there is an observer on the sidewalk, and you speed by him at 0.9c. He would see the light from your headlights travel at exactly c. So, the observer measures the relative velocity between you and the photons of your headlights to be 0.1c.

However, you would also see the light from your headlights traveling at exactly c, and you observe your own velocity to be 0 (you are not moving with respect to yourself). So, you would measure the relative velocity between yourself and the photos of your headlight to be c.

In fact, any observer moving at any relative speed (but only speeds less than c are allowed) would always observe light moving at a speed of c. This fact has surprising ramifications about the nature of space and time, and if you would like to know more I recommend you check out The Elegant Universe by Brian Greene. There is a PBS program you can get on-line:

http://www.pbs.org/wgbh/nova/elegant/program_t.html
Watch "Newton's Embarrassing Secret" for more information on special relativity.

Answer 3

If you were going the speed of light you wouldn't be able to turn your lights on.

Answer 4

you are all part of one moving system so you all go the speed of light
besides, nothing can go faster of the speed of light.
heck we cant even do light itself

Answer 5

You will create a massive blackhole and suck everything within 100,000 light years in with you.

Answer 6

I guess they would end up being tail lights

Answer 7

Maybe less dark......