Solar System - What And Where Is The Solar System?, Solar System Inventory, The Solar Nebula Hypothesis, The Angular Momentum Problem
major sun planets
The solar system comprises the Sun, nine major planets, some 100,0000 asteroids larger than 0.6 mi (1 km) in diameter, and perhaps 1 trillion cometary nuclei. While the major planets lie within 40 astronomical units (AU) of the Sun, the outermost boundary of the solar system stretches to 1 million AU, one third the way to the nearest star. It is believed that the solar system was formed through the collapse of a spinning cloud of interstellar gas and dust.
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The central, and most important object in our solar system is the Sun. It is the largest and most massive object in the solar system—its diameter is 109 times that of Earth, and it is 333,000 times more massive. The extent of the solar system is determined by the gravitational attraction of the Sun. Indeed, the boundary of the solar system is defined as the surface within which the gravitat…
One of the central and age-old questions concerning the solar system is, "How did it form?" From the very outset we know that such a question has no simple answer, and rather than attempting to explain specific observations about our solar system, scientists have tried to build-up a general picture of how stars and planets might form. Therefore, scientists do not try to explain why t…
Astronomers almost universally believe that the best descriptive model for the formation of the solar system is the solar nebula hypothesis. The essential idea behind the solar nebula model is that the Sun and planets formed through the collapse of a rotating cloud of interstellar gas and dust. In this way, planet formation is thought to be a natural consequence of star formation. The solar nebula…
Precise dating of meteorites and lunar rock samples indicate that the solar system is 4.6 billion years old. The meteorites also indicate an age spread of about
Figure 3. Condensation sequence and temperature versus distance relation in the young solar nebula. Illustration by Hans & Cassidy. Courtesy of Gale Group.
20 million years, during which time the planets themselves formed. T…
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