Jovian planets began growing by the same process but the outer solar nebula

Jovian planets began growing by the same process but

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Jovian planets began growing by the same process, but the outer solar nebula contained not only solid bits of metals and silicates, but also abundant ices. The Jovian planets grew rapidly and quickly became massive enough to grow by gravitational collapse, drawing in large amount of gas from the solar nebula. The process of planet formation was almost completely finished by the tie tihe solar system was about 30 million years old. Continuing Bombardment of the Planets Bombardment represents the slow continuation of the accretion of the planets. Earth’s moon, mercury, Venue Mars, and most of the moons in the solar system are covered with craters. A few of these have been formed recently by the rain of meteorites. Most of the craters appear to have been formed more than 4 billion years ago in what is called the heavy bombardment. Heavy bombardment: the intense cratering that occurred sometime during the first 0.5 billion years in the history of the solar system. The Jovian Problem The gas and dust disks around newborn stars don’t last long. Those disks are being evaporated  by the intense ultraviolet radiation from hot stars within the nebula. This
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evaporation process must happen to most disks. Even if a disk did not evaporate quickly, the gravitational influence of the crowded stars in a cluster should quickly strip away  the outer parts of the disk. It seems to mean that planet-forming disks around young stars must evaporate within 100 000 years or so. That’s not long enough to grow a Jovian planet by the processes in the solar nebula theory. The rotating gas and dust of the solar nebula could have become unstable and formed outer planets by direct gravitational collapse. Massive planets may have been able to form directly from the nebula gas without first accreting a dense core from planetesimals. Explaining the Characteristics of the Solar System The Sun and planets revolve and rotate in the same direction because they formed from the same rotating gas cloud. The orbits of the planets lie in the same plane because the rotating solar nebula collapsed into a disk, and the planets formed in that disk. Evolutionary theory : An explanation of a phenomenon involving slow, steady processes of the sort seen happening in the present day. Ex. Venus rotates backward, the Sun can produce tides in the thick atmosphere of Venus that eventually could have resulted in the reversal of that planet’s rotation. Catastrophic theory : An explanation of a phenomenon involving special, sudden, perhaps violent, events. Ex. Uranus rotates on its side could have been caused by off centre impacts of massive planetesimals on each planet as they were forming. Condensation sequence explains why planets divide into Terrestrial and Jovian. The Terrestrial formed in the inner part of the solar nebula, temperature was high and only compound such as metals and silicates could condense to form solid particles.
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  • Winter '12
  • ArthurRead
  • Solar System, Planet, solar nebula

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