Math CentralQuandaries & Queries


Question from julie:

if i was travelling in a spacecraft at the speed of light and i turned on my headlight would i see the beam ?

As a spaceship cannot travel at the speed of light (nothing with mass can) there isn't really an answer to this.

But if you were in a spaceship traveling at, say, 99.99% of the speed of light, your headlight (and lights in the cabin) would act just like lights of a stopped spaceship. This is because very high speeds don't add the way lower speeds do. This is surprising but has been experimentally tested in many ways.

Good Hunting!

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