Light Flashlight

If a spacecraft is traveling at the speed of light and a flashlight is turned on pointing the opposite way…?

would the light coming from the flashlight stand perfectly still? If so how can it since light is made of photons that behave with wave-like properties?

Be extremely careful when you talk about any object with ordinary rest mass traveling at the speed of light. It takes infinite energy to get an ordinary object to the speed of light, and is therefore impossible.

You should change your wording to use, say “99% of the speed of light”, or some other fraction. In such a case, both a member on board the spacecraft and the “stationary” space walker will see the light beam as traveling at the speed of light. This is one of the postulates of relativity, the speed of light always equals its fundamental value in all reference frames.

You might want to study the equations of special relativity to understand this more. They were derived from the light clock thought experiment. Relative relativistic speeds do not add up as you naively understand for slower moving objects. Time is not as much a constant value when relativistic effects occur.

Flash Light (Part 1)- Houston 1978

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