Lecture-1 - Lecture # 1 A Brief Tour of the Universe...

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9/27/11 Physics 20 Lecture 1 1 Lecture # 1 A Brief Tour of the Universe DeFnition of planets, stars, galaxies and the Cosmos • Our position in the Universe • The Sun, planets and the solar system • Asteroids and comets • A brief history of the Universe • Basic concepts in astronomy
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9/27/11 Physics 20 Lecture 1 2 What are Stars ? • Our Sun is an average star • There are billions of stars in our Galaxy • Stars form from gas and dust • Stars evolve and their luminosity changes during their lifetime • They eventually turn to black holes or supernovae • Supernovae explode and produce the heavy elements we see around today
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9/27/11 Physics 20 Lecture 1 3 Stars are large and glowing balls of gas, generating light and heat through fusion Our Sun is a star. (see next two slides)
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9/27/11 Physics 20 Lecture 1 4 Star forming regions in our Galaxy
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9/27/11 Physics 20 Lecture 1 5 A typical star cluster. Stars are found in either open or globular clusters
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9/27/11 Physics 20 Lecture 1 6 Planets the Moons and the Solar System • Planets are orbiting the stars. They refect light From the stars and this is why they are bright. They don’t have light oF their own. • Our Earth is a planet along with nine others in the solar system. • Moons are the satellites orbiting the planets • The Sun is a star at the center oF our solar system with the planets orbiting it. • Many oF our solar system planets have moons orbiting them
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9/27/11 Physics 20 Lecture 1 7 Mercury Venus Earth Mars Jupiter Saturn Uranus Pluto Neptune Sun (6,000 Kelvin Surface Temperature) Our Solar System
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9/27/11 Physics 20 Lecture 1 8 Jupiter’s Galilean Moons Saturn’s Major Moons Uranus’ Major Moons Neptune’s Triton Saturn’s Titan
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Earth-Moon as seen from Space 9/27/11 Physics 20 Lecture 1 9
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The Earth as seen from Space 9/27/11 Physics 20 Lecture 1 10
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Lecture-1 - Lecture # 1 A Brief Tour of the Universe...

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