astronomy lecture 8

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10 Terms

1
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galileo invented and saw what

telescope and rough moon surface, dark spots on sun, rings around saturn, moons orbiting jupiter

2
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what did galileo notice about venus

it changes shapes as it moves

3
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how does Ptolemy explain the phases of venus

only crescent and new phases are seen - venus is always between sun and earth

4
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how does copernican explain the phases of venus

all phases are seen - venus orbits the sun

5
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brahe did what

highly accurate measurements between stars and planets

6
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kepler discovered

planets orbit in ovals, ellipse with two foci (centers)

7
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in an ellipse planets orbiting closer to the sun move & why

faster - suns gravity is pulling them to go faster

8
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in an ellipse planets orbiting opposite to the sun move

slower

9
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planets with large orbits move

slowly

10
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planets with small orbits move

quickly