How Solar Solar Systems Formed

Created by: Jackie

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Definition:

The system containing the sun and the bodies held in its gravitational field, including the planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto), the asteroids, and comets. The Solar System contains billions of other objects and extends far beyond the outermost planets. There are several hundred thousand asteroids revolving around the Sun. In addition, there are more than 800 comets scientists have recorded passing through the inner part of the solar system.

imagesCAJ1PFJP.jpg Solar system formation:

Scientists believed that the solar system was formed because a cloud of gas and dust was disturbed by a star exploding(supernova). As with similar stars, the very young Sun was therefore surrounded by gas and dust leftover from its formation. Through a series of collisions between gas molecules and dust particles, this material became organized in the form of a circumstellar disk. The circumstellar disk is where planets formed.

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Facts:

- At the heart of the solar system is our sun. The four planets nearest it are rocky, terrestrial worlds-- Mercury, Venus, Earth and Mars.

- After that are four gas giants-- Jupiter, Saturn, Uranus and Neptune. Between the orbits of Mars and Jupiter lies the asteroid belt, which includes the dwarf planet Ceres.

- Beyond the orbit of Neptune one finds the disk-shaped Kuiper belt, in which dwarf planet Pluto resides, and far beyond that is the giant, spherical Oort Could and the teardrop-shaped heliopause.

- The sun's age was calculated in 1989 to be 4.5 billion years old, less than the 4.7 billion years previously believed. It was formed from a cloud of hydrogen mixed with small amounts of other substances that had been produced in the bodies of the other stars before the Sun was born.
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Links:

http://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/solarsysform.htm

http://www.windows2universe.org/our_solar_system/formation.html
http://www.thefreedictionary.com/solar+system
http://space.about.com/od/astronomydictionary/g/solar_system.htm
http://www.astronomy.org/astronomy-survival/solform.html
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