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- Protoplanet abstract "A protoplanet is a large planetary embryo that originated within a protoplanetary disc and has undergone internal melting to produce a differentiated interior. Protoplanets are thought to form out of kilometer-sized planetesimals that gravitationally perturb each other's orbits and collide, gradually coalescing into the dominant planets.In the case of the Solar System, it is thought that the collisions of planetesimals created a few hundred planetary embryos. Such embryos were similar to Ceres and Pluto with masses of about 1022 to 1023 kg and were a few thousand kilometers in diameter. Over the course of hundreds of millions of years, they collided with one another. The exact sequence whereby planetary embryos collided to assemble the planets is not known, but it is thought that initial collisions would have replaced the first \"generation\" of embryos with a second generation consisting of fewer but larger embryos. These in their turn would have collided to create a third generation of fewer but even larger embryos. Eventually, only a handful of embryos were left, which collided to complete the assembly of the planets proper.Early protoplanets had more radioactive elements, the quantity of which has been reduced over time due to radioactive decay. Heating due to radioactivity, impact, and gravitational pressure melted parts of protoplanets as they grew toward being planets. In melted zones their heavier elements sank to the center, whereas lighter elements rose to the surface. Such a process is known as planetary differentiation. The composition of some meteorites show that differentiation took place in some asteroids.According to the giant impact hypothesis the Moon formed from a colossal impact of a hypothetical protoplanet called Theia with Earth, early in the Solar System's history.In the inner Solar System, the three protoplanets to survive more-or-less intact are the asteroids 1 Ceres, 2 Pallas, and 4 Vesta. 16 Psyche is likely the survivor of a violent hit-and-run with another object that stripped off the outer, rocky layers of a protoplanet. The asteroid 21 Lutetia also has characteristics that resemble a protoplanet. Kuiper-belt dwarf planets have also been referred to as protoplanets. Because iron meteorites have been found on Earth, it is deemed likely that there once were other metal-cored protoplanets in the asteroid belt that since have been disrupted and that are the source of these meteorites.In February 2013 astronomers made the first direct observation of a protoplanet forming in a disk of gas and dust around a distant star.".
- Protoplanet thumbnail Vesta_full_mosaic.jpg?width=300.
- Protoplanet wikiPageExternalLink 25780.
- Protoplanet wikiPageID "245586".
- Protoplanet wikiPageLength "5012".
- Protoplanet wikiPageOutDegree "33".
- Protoplanet wikiPageRevisionID "707285286".
- Protoplanet wikiPageWikiLink 16_Psyche.
- Protoplanet wikiPageWikiLink 21_Lutetia.
- Protoplanet wikiPageWikiLink 2_Pallas.
- Protoplanet wikiPageWikiLink 4_Vesta.
- Protoplanet wikiPageWikiLink Asteroid.
- Protoplanet wikiPageWikiLink Asteroid_belt.
- Protoplanet wikiPageWikiLink Category:Protoplanets.
- Protoplanet wikiPageWikiLink Category:Types_of_planet.
- Protoplanet wikiPageWikiLink Ceres_(dwarf_planet).
- Protoplanet wikiPageWikiLink Chemical_element.
- Protoplanet wikiPageWikiLink Dwarf_planet.
- Protoplanet wikiPageWikiLink Formation_and_evolution_of_the_Solar_System.
- Protoplanet wikiPageWikiLink Fusor_(astronomy).
- Protoplanet wikiPageWikiLink Giant_impact_hypothesis.
- Protoplanet wikiPageWikiLink Iron_meteorite.
- Protoplanet wikiPageWikiLink Kuiper_belt.
- Protoplanet wikiPageWikiLink Mesoplanet.
- Protoplanet wikiPageWikiLink Meteorite.
- Protoplanet wikiPageWikiLink Moon.
- Protoplanet wikiPageWikiLink Planet.
- Protoplanet wikiPageWikiLink Planetary_differentiation.
- Protoplanet wikiPageWikiLink Planetesimal.
- Protoplanet wikiPageWikiLink Pluto.
- Protoplanet wikiPageWikiLink Protoplanetary_disk.
- Protoplanet wikiPageWikiLink Radioactive_decay.
- Protoplanet wikiPageWikiLink Solar_System.
- Protoplanet wikiPageWikiLink Theia_(planet).
- Protoplanet wikiPageWikiLink File:Vesta_full_mosaic.jpg.
- Protoplanet wikiPageWikiLinkText "Protoplanet".
- Protoplanet wikiPageWikiLinkText "proto-planet".
- Protoplanet wikiPageWikiLinkText "proto-planets".
- Protoplanet wikiPageWikiLinkText "protoplanet".
- Protoplanet wikiPageWikiLinkText "protoplanets’".
- Protoplanet wikiPageUsesTemplate Template:Exoplanet.
- Protoplanet wikiPageUsesTemplate Template:Portal.
- Protoplanet wikiPageUsesTemplate Template:Reflist.
- Protoplanet subject Category:Protoplanets.
- Protoplanet subject Category:Types_of_planet.
- Protoplanet hypernym Embryo.
- Protoplanet type Embryology.
- Protoplanet type Type.
- Protoplanet type Type.
- Protoplanet type Concept.
- Protoplanet comment "A protoplanet is a large planetary embryo that originated within a protoplanetary disc and has undergone internal melting to produce a differentiated interior. Protoplanets are thought to form out of kilometer-sized planetesimals that gravitationally perturb each other's orbits and collide, gradually coalescing into the dominant planets.In the case of the Solar System, it is thought that the collisions of planetesimals created a few hundred planetary embryos.".
- Protoplanet label "Protoplanet".
- Protoplanet sameAs Q849009.
- Protoplanet sameAs Protoplaneet.
- Protoplanet sameAs كوكب_أولي.
- Protoplanet sameAs Protoplaneta.
- Protoplanet sameAs Protoplaneta.
- Protoplanet sameAs Protoplanet.
- Protoplanet sameAs Protoplanet.
- Protoplanet sameAs Protoplaneta.
- Protoplanet sameAs Protoplaneet.
- Protoplanet sameAs Protoplaneetta.
- Protoplanet sameAs Protoplanète.
- Protoplanet sameAs קדם-כוכב_לכת.
- Protoplanet sameAs Protoplanet.
- Protoplanet sameAs Protopianeta.
- Protoplanet sameAs 原始惑星.
- Protoplanet sameAs Protoplanèt.
- Protoplanet sameAs Protoplanéit.
- Protoplanet sameAs Proplaneta.
- Protoplanet sameAs Protoplanet.
- Protoplanet sameAs Protoplaneta.
- Protoplanet sameAs Protoplaneta.
- Protoplanet sameAs m.01kjzy.
- Protoplanet sameAs Protoplanetă.
- Protoplanet sameAs Протопланета.
- Protoplanet sameAs Protoplanéta.
- Protoplanet sameAs Protoplanet.
- Protoplanet sameAs Протопланета.
- Protoplanet sameAs Q849009.
- Protoplanet sameAs 原行星.
- Protoplanet wasDerivedFrom Protoplanet?oldid=707285286.
- Protoplanet depiction Vesta_full_mosaic.jpg.
- Protoplanet isPrimaryTopicOf Protoplanet.