Einstein's Theory of Special Relativity

Einstein's Greatest Insight: Gravity Explained—Documentary For Sleep

Astroalien on Instagram: "Spacetime doesn’t ask permission. Gravity doesn’t act on things.It shapes the stage they move on as per GR. Light has no mass, yet gravity bends it, not because it’s pulled, but because spacetime is curved which is the new definition of gravity according to the general theory of relativity. So it doesn't matter if you have mass or not, as long as you exist in spacetime, gravity in the form of purely geometric spacetime curvature dictates the rules of your motion. What m