1825 - Pierre Laplace completes his study of gravitation, the stability of the solar system, tides, the precession of the equinoxes, the libration[?] of the Moon, and Saturn's rings in Mecanique Celeste[?]
1843 - John Adams predicts the existence and location of Neptune from irregularities in the orbit of Uranus
1846 - Urbain Leverrier predicts the existence and location of Neptune from irregularities in the orbit of Uranus
1849 - Edouard Roche[?] finds the limiting radius of tidal destruction and tidal creation for a body held together only by its self gravity, called the Roche limit, and uses it to explain why Saturn's rings do not condense into a satellite
1856 - James Clerk Maxwell demonstrates that a solid ring around Saturn would be torn apart by gravitational forces and argues that Saturn's rings consist of a multitude of tiny satellites
1866 - Giovanni Schiaparelli realizes that meteor streams occur when the Earth passes through the orbit of a comet that has left debris along its path
1978 - Peter Goldreich[?] and Scott Tremaine[?] present a Boltzmann equation[?] model of planetary-ring dynamics for indestructible spherical ring particles that do not self-gravitate and find a stability requirement relation between ring optical depth and particle normal restitution coefficient