Solar System

Topics: Solar System, Planet, Earth Pages: 3 (911 words) Published: April 19, 2006
The Solar System

The solar system still to this day one of the most fascinating subjects of study in the science world. In our time, we are one of the first generations to see the planets of our solar system up close, and we have been able to view evolution of these planets through time. Our solar system consists of a middle aged star called the Sun, 9 planets, about 100 moons, thousands of asteroids, millions of icy bodies, and many comets revolving around all of it. We can begin by looking at the origin of the solar system. The protoplanet nebular model is the theory that is most widely accepted to describe the origin of the solar system. The model is made up of 3 stages: A, B, and C. Stage A is the beginning of the creation of the elements that are heavier than hydrogen in previously existing stars. Part 2, stage B, is when the nebula is formed from the raw materials that were created in the first stage, A. With gravitational attraction, the nebula contracts forming the protosun in the center of the nebula. The protosun is then surrounded by a fat, bulging accretion disk around it. The sun forms from the protosun, and the planets form in the accretion disk. Stage C, Part 3, begins as the protosun becomes established as a star. The original nebula's icy remains then become the birthplace of comets.

The first planet is Mercury. It is the innermost planet to the sun. It is also the eighth largest planet. Mercury is the brightest planet, because it is so close to the sun, which causes extremely high heat temperatures. The planet moves around the sun in about 3 months, giving it the shortest "year" of all the planets in the solar system. Mercury is named after the mythical roman messenger of speed.

The next planet is Venus. It shines very brightly because it is always covered with clouds, which reflects 80% of the sunlight. Venus spins very slowly, and each day on Venus is longer than a whole Venus year. It is unusual, because the planet spins the...
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