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Imagine there is a train moving at .9c with a person on the train and an observer on a platform watching the train go by.

The person on the train walks forward while shining a flashlight. To the observer on the platform, the person on the train is time dilated and walks forward in "slow motion," but the observer measures the light from the person's flashlight as c because c is constant and independent of an inertial frame of reference.

So my question is, is light (and other massless objects) immune to time dilation?

As always, thank you.

The person on the train walks forward while shining a flashlight. To the observer on the platform, the person on the train is time dilated and walks forward in "slow motion," but the observer measures the light from the person's flashlight as c because c is constant and independent of an inertial frame of reference.

So my question is, is light (and other massless objects) immune to time dilation?

As always, thank you.

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