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15 - Edmodo
15 - Edmodo

... 3. The Composition of our Solar System After the Sun formed, the leftover dust, gases, and other debris in the nebula continued to spin, creating a disk around the new star. Small bodies began to form, growing into the planets, moons, asteroids, and comets that make up the solar system. The next lar ...
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Report - WordPress.com
Report - WordPress.com

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Astronomical unit

The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun. However, that distance varies as the Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year. Originally conceived as the average of Earth's aphelion and perihelion, it is now defined as exactly 7011149597870700000♠149597870700 meters (about 150 million kilometers, or 93 million miles). The astronomical unit is used primarily as a convenient yardstick for measuring distances within the Solar System or around other stars. However, it is also a fundamental component in the definition of another unit of astronomical length, the parsec.
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