You always hear this phrase if you watch something about astrophysics ‘Nothing can move faster than light’. But speed is only relative. How can this be true if speed can only be experienced/measured relative to something else?
In: Physics
Imagine a motorbike speeding down the highway. Its speed is relative to the rotation of the Earth, or someone standing still.
Now, the motorbike turns on its headlights. The light beaming out from it moves at the speed of light instantly regardless of how fast the bike is moving. The bike’s speed is not added to the speed at which that light travels. The speed of light is not relative, that’s why it’s special.
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