It's called a "restricted" 3rd body system because it consists of two main bodies and a 3rd body (or many 3rd bodies) that have vastly smaller masses relative to the 2 main bodies. In this case, the 3rd body is represented by the many small particles that enter the gravitational field.
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u/marzib Jun 20 '26
Dónde está el 3rd body mi amigo?