Episode 136: Introduction to General Relativity
The Science of Everything Podcast
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The Geodesic of the Universe
According to Einstein, all objects in the universe travel along geodesics. The only force that acts on them is the force of gravity or in general relativity. And because space is curved, the paths of these two objects move closer to each other. So massive objects look like they're exerting a force on each other and thereby cause each other to accelerate towards each other. But what actually happens is that the objects are just moving on their merry way along their geodesics,. but space curves because of their mass and so it looks like they've been pulled together.
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