Planetesimals
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Planetesimal definition is any of numerous small celestial bodies that may have existed at an early stage of the development of the solar system.
The planetesimals formed the core of these gaseous planets which turned molten when it enough heat was created.
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Planetesimals. Planetesimals are small rock fragments that were the seeds of the current planets. This dichotomy is a natural outcome of formation models assuming that planetesimal accretion occurred nearly instantaneously. Consolidations of these rocky planetesimals formed the four small dense inner or terrestrial planetsmercury venus earth and mars. Any of innumerable small bodies thought to have orbited the sun during the formation of the planets.
Dubious discuss believed to have formed about 46 billion years ago in the solar system they are valuable in studies of the formation of it. Other planetesimals turn into comets kuiper belt objects kbos and trojan asteroids. Modern meteorite classification schemes assume that no single planetary body could be source of both unmelted chondritic and melted achondritic meteorites. Planetesimal definition one of the small celestial bodies that according to one theory planetesimal hypothesis were fused together to form the planets of the solar system.
Planetesimal plaentsmel astronomy n astronomy any of a number of small bodies formerly thought to have been drawn from the sun by. The planetesimals that eventually formed from the solid material present thus were deficient in volatiles but rich in silicates and other less volatile materials which solidified at the higher temperatures. Planetesimals p l ae n t s m el z are solid objects thought to exist in protoplanetary disks and in debris disksper the chamberlinmoulton planetesimal hypothesis they are believed to form out of cosmic dust grains. However it has recently been proposed that the accretion of many planetesimals lasted over 1 million years.