planetary migration

This planetary migration is now thought to have been responsible for much of the Solar System's early evolution.

Irregular planetary migration would result in the depletion of the associated trojan reservoir.

At the time, this close distance was not compatible with theories of planet formation and resulted in discussions of planetary migration.

Goldreich, along with Tremaine predicted planetary migration in 1980, which would later be invoked to explain hot jupiters.

Planetary migration is the most likely explanation for hot Jupiters, extrasolar planets with jovian masses and orbits of only a few days.

It may have remained dynamically cold and thus its orbit may not be a direct result of significant perturbations during Neptune's outward planetary migration.

This means it could have been captured after planetary migration, but may as well be a long-term member that happens not to be perfectly dynamically stable.

Astronomy professor Eric Agol argues that white dwarfs may support a relatively brief habitable zone through planetary migration.

S'task also used the article to suggest something slightly radical: the idea that a largish planetary migration might be the tool necessary to curtail the planet's violence.

The second theory, part of the Nice model, proposes that the Trojans were captured during planetary migration, which happened about 500-600 million years after the Solar System's formation.

This means that Uranus and Neptune probably formed closer to the Sun-near or even between Jupiter and Saturn-and later migrated outward (see Planetary migration below).

The event was brief but gentle, saving Triton from collisional disruption; and events like this may have been common during the formation of Neptune, or later when it Planetary migration.

Some astronomers believe the system may have undergone planetary migration and Gliese 581 c may have formed beyond the frost line, with a composition similar to icy bodies like Ganymede.

As Jupiter migrated inward following its formation (see Planetary migration below), resonances would have swept across the asteroid belt, dynamically exciting the region's population and increasing their velocities relative to each other.

Planetary migration occurs 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.

If vulcanoids are found not to exist, this would place different constraints on planet formation and suggest that other processes have been at work in the inner Solar System, such as planetary migration clearing out the area.

Metal-rich stars tend to have easily detectable planets because higher metallicities tend to either facilitate the creation of gas giants or to promote planetary migration, in which the planet orbits more closely to its star.

Water planets could result from inward planetary migration and originate as protoplanets that formed from volatile ice-rich material beyond the snow-line but that never attained masses sufficient to accrete large amounts of H/He nebular gas.

This effect has been used to show that as many as 25% of hot Jupiters are orbiting in a retrograde direction with respect to their parent stars, strongly suggesting that dynamical interactions rather than planetary migration produce these objects.

There is no consensus on how to explain these so-called hot Jupiters, but one leading idea is that of planetary migration, similar to the process which is thought to have moved Uranus and Neptune to their current, distant orbit.

Most of the known perturbations to motion in stable, regular, and well-determined dynamical systems tend to be periodic at some level, but in many-body systems, chaotic dynamics result in some effects which are one-way (for example, planetary migration).

Still, Grmek warns that it is very difficult to determine the pathocenosis of today's world, since the constant planetary migration of large masses of people from south to north, as well as the development of communications, have turned Earth into a global village.