The speed of light is constant in all inertial frames of reference(adsbygoogle = window.adsbygoogle || []).push({});

Imagine a thought experiment, an observer at rest sending a light pulse towards a spaceship, he measures the speed of light to be 3x10^8 m/s, now assume that the spaceship also travels at the speed of light and an astronaut in spaceship also measures the speed of light pulse is 3x10^8 m/s.

my question is according to him both him and light travels at the same speed so actually he could measure the speed of light to be zero (i.e, light pulse is at rest) right?, but according to postulates of special relativity the astronaut also measures the speed of light to be 3x10^8 m/s, how?

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# Postulates of STR

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