[quote author=FGZstar link=topic=1194.msg4912#msg4912 date=1256639918]
One thing which has always puzzled me about this is if, theoretically, an object were to travel at the speed of light, would it become invisible?
[/quote]
To the driver: the time is freezed.
However, to other people, if the light enter my eye then I will see it. If it is not entering my eye, I would not be able to see it.

At night, the sun still emitting light to the sky. However, teh sky is dark because those ray moving away from us and it did not enter our eye.
Light has to enter our eye to be seen!