# Speed of light

1. Feb 5, 2006

### Mr. dude

Ok. gonna be a little hard to ask this question clearly I think. So the speed of light is always constant no matter how fast you are going. So if you were traveling at the speed of light, would the light still be going faster than you at 300,000 km/s (or however fast it is) or would it be the same particles of light in front of you that were there once you reached the speed of light? Sorry if this isn't very clear but I don't know how else to ask it. Thanks.

2. Feb 5, 2006

### rbj

you can't travel at the speed of light.

but even if you were traveling at a constant speed of 0.99 c (relative to someone else, since it would seem to you that you are not moving at all), you would still measure light to be at 299,792 km/s "faster" than you. in order for both you and the "stationary" observer that you're flying by at 296,000 km/s to measure the same beam of light to be at 299,792 km/s, then you and the other observer have to perceiving time and length (in the direction of motion) mass, etc. to be different.