Episode 136: Introduction to General Relativity
The Science of Everything Podcast
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The Effect of Gravity on the Path of Marbles
If we imagine the analog for true spacetime, it's not because there's a force acting on the marble. What's actually happening is that the marble is moving in a straight line, but on curved space. And so it's just that what straight looks like locally changes because the space itself is curved. Another way to understand this is if you look at a map of the world, like a 2D projection,. There is no way to accurately project all of the Earth's surface on a 2D map without distortion of shape and or size.
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