Solar System dynamic theories

overview of formation and evolution of the Solar System

thumb|300px|right|Debris disks detected in HST archival images of young stars, HD 141943 and HD 191089, using improved imaging processes (24 April 2014). thumb|486958 Arrokoth, the first pristine planetesimal visited by a spacecraft.

astrophysical process in which matter gravitationally collects into a massive object

hypothetical star orbiting the Sun, responsible of extinction events

hypothetical planet between the Sun and Mercury

hypothesized event, occurring ca. 4.1–3.8 billion years ago, during which a large number of asteroids collided with the Moon, Mercury, Venus, Earth, and Mars

theory that the Moon formed out of the debris left over from a collision between Earth and an astronomical body the size of Mars, approximately 4.5 billion years ago

Öpik–Oort Comet Cloud hypothetical planet

any Solar System planet that might orbit the Sun beyond Neptune

astronomical phenomenon when a planet or other stellar satellite interacts with a disk of gas or planetesimals, resulting in the alteration of the satellite's orbital parameters, especially its semi-major axis

astrophysical model of planetary migration in the Solar System

in the early days of the Solar System, Jupiter moved inward then reversed course ("tacked") to its current orbit

scientific proposal in 2002 for a destroyed fifth planet

aspect of history

numerical model of the early Solar System

a scenario of the giant planet migration