Physics - Modern Physics - Relativity - General relativity - gravity as curved spacetime - Curved Spacetime Visualizer

The classic rubber sheet analogy (but noting its limitations). Show a 2D grid representing spacetime. Place a mass (like the Sun) on it - the grid warps/curves around it (deeper well for bigger mass). Roll a 'planet' ball onto the grid - it follows the curvature (orbits!). Controls: (1) Mass of cent