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Someone watching a car<BR>
accelerate toward light speed

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would see something<br>
very strange.

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It would seem as though the<br>
car itself were getting shorter

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and that time for the person<br>
in the car was slowing down.

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However, you wouldn't<br>
see these effects

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until the car began to<br>
approach the speed of light.

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At 90% of the speed of light

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the car would appear to shrink<br>
to 44% of its usual length.

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This thought experiment

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answered Einstein's<br>
old question

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about what he would see 

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if he traveled along<br>
with a beam of light.

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He simply couldn't<br>
make the trip

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for at the speed of light,<br>
length would contract to zero

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and time would stop.

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