2_Origin_of_Earth__Ocean - Origin and Earth & Oceans...

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1 Outline Origin Of… 1. Universe 2. Galaxy 3. Solar System 4. Earth and Moon 5. Atmosphere 6. Ocean 1. Names of Major Oceans 2. Average Depth of the Ocean 3. Latitude and Longitude 4. Contour Plots and Hydrographic Sections
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2 Galaxy Formation 100,000 light-years across SUN One milky-way rotation takes about 250 My Milky-Way Galaxy 1. Big Bang 15 billion years ago: All mass in universe compressed to single point 10 9 kg m -3 density, T =10 12 K 2. Aggregates of ejected material form nebula that collapsed gravitationally to form earliest stars and galaxies. 3. Temperatures in cores of stars increases due to compressional heating 4. When temperatures in stars reached 10 million K, nuclear fusion of H into He, and some other light elements, releasing energy to power the stars. 5. As early stars aged, they ultimately exploded, ejecting heavier elements into the universe Summary of Universe/Galaxy/Star Formation
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3 Formation of Solar System Hydrogen (H), He (He) and “star dust” (heavier elements that were formed in previous stars) Formation of Solar System Formation of Solar System
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4 Formation of Solar System Terrestrial (inner) planets relatively small contains the heavier elements (Fe, Si, O) rocky shell over a metallic core accretion began 4.567 billion years ago it took about 0.1 billion years (100 million years) for planets to form
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2_Origin_of_Earth__Ocean - Origin and Earth & Oceans...

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