Einstein asked question himself what a light wave would look like if you were to chase after it at exactly light speed. Since you and the light wave would be zipping through the space at exactly same speed, you would be keeping perfect pace with light. So from your perspective light should appear as though it wasn’t moving. So you should able to catch a handful of motionless light.

But Maxwell’s equation didn’t allow to catch the light. Because this equation doesn’t allow light to appear stationary. It means speed of light is constant. No matter the observer in motion or not, it always get measures 300000 km/s.

And einstein was well aware about that. And then he realized, if space is absolute, the speed of light would not be same for all observers. To maintain the speed of light constant space stretches or contracts. This is called Special relativity theory. Not only space, but time also stretches called time dilation.

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