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29-gravitation - Phys 211 Chapter 13 Gravitation...

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Phys 211 4/6/09 Chapter 13 Gravitation
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Unravelling the Universe Look up to the sky and ask why? 1463-1543 Copernicus Put the sun at the center of the solar system 1564-1642 Galileo invented the telescope 1550-1601 Brahe planetary measurements 1570-1630 Kepler devised “laws” 1665 Newton derived Kepler 1900 Einstein Equivalence Principle Prior to 1500, the Earth was the center of the universe
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Earth and Moon Which is stronger, Earth’s pull on the Moon, or the Moon’s pull on Earth? 1) the Earth pulls harder on the Moon 2) the Moon pulls harder on the Earth 3) they pull on each other equally 4) there is no force between the Earth and the Moon 5) it depends upon where the Moon is in its orbit at that time
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Heavenly Bodies Rotation Axis of the Celestial Sphere Polaris Celestial sphere Earth N S Star Stars follow regular paths in the evening sky. Rotate once every 24 hours about an axis through polaris. Stars have fixed relationships to other stars (constellations).
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