Lecture 12 - Formation of the Solar System How was the...

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Formation of the Solar System How was the solar system formed? Scientists have theorized that a cloud of gas and dust in space was disturbed by a supernova . When did this occur? 4.6 billion years ago The Nebular Hypothesis The explosion made waves in space. This caused the formation of a solar nebula (a flattened cloud of gas and dust).
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Formation of the Planets The centre of the solar nebula grew hotter resulting in the formation of the Sun. The outer edges cooled causing clumps of particles to stick together and form planets.
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Components of Outer Space Galaxy A cluster of billions of stars. Our solar system makes up a tiny portion of the Milky Way galaxy. Star A hot glowing ball of gas that generates energy by converting hydrogen to helium.
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The Milky Way Galaxy The Sun is located approximately 30 quintillion km from the centre of the Milky Way galaxy. It takes light nearly 100 000 years to travel from one side of the galaxy to the other.
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The Sun In the core of the Sun, the temperature is 15 million degrees Celsius. The outermost part of the Sun is called the photosphere and it is 6000 degrees Celsius. Energy from the sun controls the Earth’s climate system. The earth only receives one two-billionths of the sun’s total energy.
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The Solar System The solar system is composed of 8 planets, 60 moons, and millions of bolides . Order of the planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
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Life Cycle of Stars The Sun is the closest star to Earth and it has a life expectancy of 10 billion years. At the end of the life cycle, massive amounts of energy are released ( supernovas ).
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Bolides Definition: Extraterrestrial bodies that travel rapidly through space. Examples Asteroid : A rocky metallic material in space 10m to 1000km in diameter originating in the asteroid belt.
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  • Fall '14
  • Solar System, Impact event, Impact crater, impact craters

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