TIL: ELI5

The Three-Body Problem in Physics


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The Three-Body Problem is a concept in physics that deals with finding the motion of three objects when they all interact with each other through gravity. Picture in your mind three balls, each with their own mass, size, and direction of movement. They all pull on each other due to gravity, and figuring out how they will move over time can be very tricky.

In more simple terms, imagine playing the game of pool. When there are only two balls on the table - the cue ball and another ball - it's relatively straightforward to predict what will happen when they collide. However, when you add a third ball, the situation becomes much more complex, as now you have to take into account how that third ball will also collide with and affect the other two balls.
This problem has been puzzling scientists and mathematicians for centuries, as it is challenging to find a general formula or solution to predict the motion of these three objects with perfect accuracy. It’s crucial in understanding and predicting the movement of celestial bodies, such as planets, stars, and moons, in space.
You may ask, "Why only three bodies? Why not four, five or more?" The answer is that the Three-Body Problem is the simplest yet most complex problem in this field. If we can't solve it for three bodies, then it becomes even harder to tackle it with more objects involved.
In conclusion, the Three-Body Problem is a complex concept in physics involving the gravitational interactions between three objects. It's one of those ideas that demonstrates the challenges of predicting complicated natural processes, and despite centuries of work, a general solution still eludes us.

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TIL: ELI5By TIL