Lecture6 - Answers to homework #2 must be submitted no...

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Answers to homework #2 must be submitted no later than Friday, February 3, 5:00 pm.
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Competing models for the Universe: Geocentric Heliocentric How do we decide?
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Observe: Patterns are seen in the locations and motions of stars, sun, moon, and planets in the sky – observed facts Question: What causes these patterns Hypothesis: Develop a model – must be testable Test: Test the model
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A hallmark of science is that theories are testable
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(Some of) Galileo’s Observations Galileo saw craters and shadows cast by the mountains on the Moon ( Moon had a landscape; it was a “place”, not a perfect heavenly body ) Sunspots ( sun not “perfect”) Rotation of sun Moons of Jupiter ( Heavenly bodies existed which did not orbit the earth ) Phases of Venus, all phases seen.
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Changes in the appearance of Venus
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Phases of Venus 2002
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Galileo’s observation of the phases of Venus was the final evidence that buried the geocentric model. Geocentric Heliocentric No gibbous or full phases! All phases are seen! Galileo observed all phases!
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The revolution was nearly complete… The structure of the universe had been totally changed. The motions of the planets were understood, at least from a geometrical perspective. Earth was no longer a “special” place in the universe. The crowning achievement was yet to come - discovering the laws of nature and that naturally led to the newly determined structure.
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What is matter? What is energy?
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Lecture6 - Answers to homework #2 must be submitted no...

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