As the denser regions pulled in more and more matter, conservation of momentum caused it to begin rotating, while increasing pressure caused it to heat up. e. a volcanic event. b.tensional forces In essence, this theory states that the Sun, the planets, and all other objects in the Solar System formed from nebulous material billions of years ago. D) faster due to conservation of angular momentum. His Trait de mcanique cleste (Celestial Mechanics), appearing in five volumes between 1798 and 1827, summarized the results obtained by his mathematical, According to the nebular hypothesis, part of an interstellar cloud of dust and gas underwent gravitational collapse to form a primeval solar nebula. The appearance and composition of these meteorites is just what we'd expect if metal and rock condensed and accreted as the nebular theory suggests. E) the polar cap of Mars. There are the intrinsic gradualists and the extrinsic catastrophists. A) the direction the comet is traveling. Artem has a doctor of veterinary medicine degree. All ________ planets have rings around their equators. [73] The orbits of many of these planets and systems of planets differ significantly from the planets in the Solar System. (Venus may be an exception, since some claim it is becoming tidally locked to the Sun Mercury is instead locked in a 3:2 resonance and it is in fact now retrograde with a putative near axis lock.) A) all spin slower than the Earth. c. the Earth B) jovian satellites A) Planetary density increases with increasing distance from the Sun. [20] During this stage embryos expel remaining planetesimals, and collide with each other. All sorts of bodies up to protoplanets can be grown quickly and, when over the problematic size, will start to clear the disk rather than being braked by it. a ________. Alas, it seems that it questions that have to do with origins that are the toughest to answer. Meteorites are important because_ He proposed instead the catastrophic or tidal theory, first suggested by the American geologist Thomas C. Chamberlin. [21] In the framework of the solar nebular model two theories for their formation exist. The Oort Cloud is believed to be They are smaller and composed mainly of metals and rocks. The Condensation Sequences & Planetary Formation, Nebular Theory | Nebular Hypothesis: Explanation. An interesting problem for terrestrial planets is the meter size problem (IIRC the name). Because metallic elements only comprised a very small fraction of the solar nebula, the terrestrial planets could not grow very large. Gravitational scattering by other planets onto eccentric orbits with a perihelion near the star followed by the circularization of its orbit due to tidal interactions with the star can leave a planet on a close orbit.
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