Just a random question regarding the speed of light. I am not a physics major or a college student, just curious. I was watching a program on the science channel (I think) and it was talking about how the speed of light is absolute. The example it gave was traveling in a car at a high rate of speed then turning on a flash light facing in the same direction as the car. So if the car was going 100 mph it wouldn't add on to the speed of "C", since it is absolute. So, my question is since the earth is moving in our solar system and our sun is moving in our galaxy and our galaxy is moving in space, how can we know the true value of "C" if we don't know what stationary is? Does this make sense? I might be looking at this the wrong way but I figure someone here might know. Thanks.