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The Moon - Atmosphere 79 nitrogen 20 oxygen • Much of the...

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The Moon all planets orbit the sun in the same direction Most rotate in this direction too –uranus and venus don’t So does the sun Orbits are all nearly in the same plane o Pluto is 17 degrees off Nebular Hypothesis o Initially a gravitationally contracting, slowly spinning cloud of gas and dust o Spins faster as it contracts o Material contracts until centrifugal force balances gravity – makes a disk o Sun forms in center; planets form in outer parts of the disk o Sun’s early wind blows away the extra gas o Formulated by Kant and LaPlace in the 18 th century Orion protoplanetary disks o Allowed us to look at other solar systems Terrestrial Planets o All are close to the sun o All have relatively short orbital periods o Not very massive, but dense o Close to the Sun and have few moons o They have rocky outer parts Earth o Has an iron core o Partially flowing mantle Convection cycles –moves the tectonic plates Volcanoes at the meeting points o Atmosphere is relatively small
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Unformatted text preview: Atmosphere 79% nitrogen, 20% oxygen • Much of the oxygen due to life: photosynthesis o Magnetic field Caused by the outer iron core – currents produce magnetic field Polarity reverses every 300,000 years Traps most of the energetic charged particles from outer space If we didn’t have the magnetic field, these particles would often mutate our cells- wouldn’t be conducive to life on earth o Northern and Southern Lights Produced by charged particles hitting our atmosphere o Tides –Differential forces of the Moon, mostly Force by Moon on Earth • Greatest on near side, smaller on the center, smallest on far side • 2 tides per day, not 1 • Act as if all of the mass were in the center of the Earth Tides separated by about 12 hours Sun doesn’t affect as heavily because it is so much further away • Sun’s differential force is only ½ of the moon’s...
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