the.com/celestial mechanics
physics for things too big to argue with and too far to touch.
means the branch of physics that calculates how planets, moons, and orbits move under gravity's rules.
from newton showed gravity bends both apples and moons the same way; laplace spent decades proving the solar system's orbits are stable, not slowly collapsing, in his sprawling treatise literally titled traite de mecanique celeste.
three-body problemadd a third mass, math collapses into chaos
predicted planetneptune was found by orbit math alone, 1846
still unsolvedexact long-term stability of solar system remains unproven