Lecture 1 - Lecture #1: Universe & Solar System...

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Big Bang- Happened 13.7 billion years ago. The Big Bang is a hypothetical center of the universe that spreads outwardly. Galaxy- Collection of Solar Systems. Solar System- Made up of star at the center. They have heavenly bodies that are held into orbit by the immense gravitational pull of the planets that rotate around the star. Spiral Galaxy- Appears to be rotating clockwise and have arms that flail out from the center Bar Spiral Galaxy- It looks like a spiral galaxy with a bar through its middle. The bar consists of stars. Elliptical Galaxies- A galaxy having an approximately ellipsoidal shape and a smooth nearly featureless brightness profile. Nebular Hypothesis of Solar System Formation- Start with a giant cloud of hydrogen. As it gains mass it builds gravity and begins to attract additional atoms of hydrogen. Small chunks grow and collide, eventually becoming large aggregates of gas and solid chunks. Proto-Planetary Disk- Forms around a young star. It is a circular mass of dust, ice and gas
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Lecture 1 - Lecture #1: Universe & Solar System...

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