Einstein’s special theory of relativity challenged the traditional Newtonian ideas about space and time. He argued that there is no such thing as absolute motion, and that the laws of physics must be the same for all observers. This means that time and space are in the eye of the beholder - they depend on the observer’s point of view. The faster you move, the slower time passes for you. This idea was later confirmed by experiments with atomic clocks on airplanes.

Einstein’s general theory of relativity took things a step further and said that gravity is not a force, as Newton believed, but the curvature of space and time caused by the presence of matter and energy. This was a radical departure from classical physics, and it took years for the scientific community to fully embrace the idea. But Einstein’s theory has been repeatedly confirmed through experiments and observations, from the bending of light around massive objects to the existence of black holes.

Einstein’s theories of relativity have had a profound impact on our understanding of the universe, from the behavior of stars and galaxies to the nature of spacetime itself. They have also led to breakthroughs in fields such as GPS technology and gravitational wave astronomy, and continue to influence our thinking about the fundamental nature of reality.