How Did the Solar System Form?

http://www.space.com/35526-solar-system-formation.html

In the article, “How Did the Solar System Form?” correlates to our tenth objective, “I can describe the nature of our solar system and how it was formed” sufficiently.  From what we have discussed in class, we know of the two major types of planets; terrestrial and jovian. The terrestrial planets were made from metal and rock that condensed in the inner solar system, while the jovian planets are giant gaseous outer planets. In the section, “Temperature and Formation of Our Solar System” of our lecture tutorial book, we were able to identify which planets fell under these two major types based off of the graph given that showed the conditions and temperatures. We found out that the planets formed at temperatures hotter than the boiling point of water were essentially the terrestrial planets, while the planets formed at temperatures cooler than the freezing point of water were the jovian planets. According to the artilce, it gives three models developed by scientists that could explain our solar system. To begin, the article states that approximately 4.5 billion years ago our solar system was formed by gravity pulling a cloud of dust and gas together, known as a solar nebula, but that scientists are not 100% certain on the nature of this process. From our class, as well as the article, the discovery of extrasolar planets help us to determine planetary characterisitcs, such as orbital period and distance, oribital eccentricitiy, mass, size, density, and atmospheric composition and temperature. The three models that scientists have come up with are explained in the article as the core accretion model, the disk instability model, and the pebble accretion model. The first model, core accretion, states that gravity collapsed the material in on itself as it began to spin, forming the sun at the center of the nebula. Since the making of the sun was forming, other remaining material clumped together to form bigger particles and solar winds swept away lighter elements, leaving only rocky material that created the terrestrial worlds. It also states that since the lighter elements were less effected by the solar winds, they formed into gas giants, creating asteroids, comets, planets, and the moon. Next, the disk instability model states that the core accretion model faced a migration issue. The disk model says the dust and gas particles formed into one giant planet The planets could form faster, which allows them to trap vanishing lighter gases and orbitstabilizing mass.Based off of the major features of our solar system, we know that spinning disks of gas around other stars support the idea that our solar system formed a similar disk.  And lastly the pebble accretion states scientists proposed that tiny pebbles were consumed by large sized objects to grow at a faster rate, forming the large planets. I found this objective to be filled with a lot of information and ideas that made me think critically to the concept of the formation of our solar system. I never knew so much effected the features of our solar system and all of the different methods that have major impacts on this. This objective made me think hard and i found this article to help give me a better understanding of this abstraction.

 

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