Jan_3 - Astronomy 294z The History of the Universe Thursday...

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Astronomy 294z: Thursday, January 3 Professor Barbara Ryden The History of the Universe
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Before History: The Science of Origins Astronomy 294z: The History of the Universe Geological Sciences 110: History of Life on Earth Anthropology 200: Intro to Physical Anthropology Where do we come from? What are we? Where are we going?
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Barbara Ryden Office: 4035 McPherson Office hours: Mon Wed, or by appointment [292-4562] The Professor:
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The Textbook: On the Shores of the Unknown, by Joe Silk
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The Website: Contains: Lecture PowerPoint, syllabus, problem sets, & useful links. www.astronomy.ohio-state.edu/~ryden/ast294z/
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The science that studies the history (& future) of the universe is called “ cosmology cosmology ”. “kosmos” = order, harmony “logos” = word, law
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What is Science? Systematic study of the universe, using the scientific method.
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Scientific Method Gather facts Guess an explanation (guess = “hypothesis”) Test hypothesis Modify hypothesis A well-tested hypothesis = “theory”
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Looking south, 3 pm today Earth (opaque) Sky (blue) Sun ↑ horizon
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Cosmology version 1.0: Domed sky over flat earth.
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