Planetesimals

Some articles on planetesimals, planetesimal:

Nice Model - Description
... A large, dense disk of small, rock and ice planetesimals, their total about 35 Earth masses, extended from the orbit of the outermost giant planet to some 35 AU ... Planetesimals at the disk's inner edge occasionally pass through gravitational encounters with the outermost giant planet, which change the planetesimals' orbits ... These planetesimals then similarly scatter off the next planet they encounter, successively moving the orbits of Uranus, Neptune, and Saturn outwards ...
Planetesimal
... Planetesimals /plænɨˈtɛsɨməlz/ are solid objects thought to exist in protoplanetary disks and in debris disks ... A widely accepted theory of planet formation, the so-called planetesimal hypothesis of Viktor Safronov, states that planets form out of cosmic dust grains that collide and stick to form ... This is how planetesimals are often defined ...
Nice Model - Solar System Features - Trojans and The Asteroid Belt
... Under the Nice model, the planetesimals leaving the disrupted disk cross this region in large numbers, temporarily inhabiting it ... the period of orbital instability ends, the Trojan region is "dynamically closed", capturing planetesimals present at the time ... Trojan populations are then these acquired scattered planetesimals of the primordial asteroid belt ...
Nebular Hypothesis - Formation of Stars and Protoplanetary Disks - Protoplanetary Disks
... See also Protoplanetary disk and planetesimal Under certain circumstances the disk, which can now be called protoplanetary, may give birth to a planetary system ... Further aggregation can lead to the formation of planetesimals measuring 1 km across or larger, which are the building blocks of planets ... Planetesimal formation is another unsolved problem of disk physics, as simple sticking becomes ineffective as dust particles grow larger ...
Geology Of Solar Terrestrial Planets - Formation of Solar Planets
... The objects formed by accretion are called planetesimals—they act as seeds for planet formation ... Initially, planetesimals were closely packed ... After the planetesimals grew bigger in sizes, collisions became highly destructive, making further growth more difficult ...