Celestial Motion - WOU Homepagebrownk/ES104/ES104.2006.1003.CelestialMotionMoon.f.pdf · Celestial...
Transcript of Celestial Motion - WOU Homepagebrownk/ES104/ES104.2006.1003.CelestialMotionMoon.f.pdf · Celestial...
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Celestial Motion
Chapter 21, pages 597-606
Lab starts this week—NS 017
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Brief Review
• Sun is at the center of the solar system• Published by Copernicus
– Supported by Galileo’s telescopic observations of Jupiter and Venus
• Kepler determined orbits are ellipses• Newton determined orbits created by
interaction of inertia and gravity
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Constellations
• Star groups• 88 recognized• Stars names by brightness in them
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Orion
• Hunter• White Tiger• Southern Sky
• http://lithops.as.arizona.edu/~jill/EPO/Posters/Orion/protoplanets.html
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Star names in Orion
• http://borghetto.astrofili.org/costellazioni/costellazioni.htm
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• http://www.windows.ucar.edu/the_universe/images/starmaps/map_orion.jpg
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• http://www.windows.ucar.edu/cgi-bin/tour_def/the_universe/images/starmaps/map_canis_major_jpg_image.html
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• http://www.windows.ucar.edu/cgi-bin/tour_def/the_universe/Arcturus.html
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Earth Movement
• Rotation on axis• Revolution (orbit) around Sun
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What is a ‘day’?
• Mean Solar Day
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What is a ‘day’?
• Sidereal Day
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What is a ‘day’?
• Mean Solar Day—24 hours• Sidereal Day—23 hours, 56 minutes
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Animation link -- http://www.astro.virginia.edu/class/oconnell/astr121/im/lunation-anim.gif
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Moon’s Motion
• Rotates on axis once each 27 1/3 days• Same side always faces Earth• No atmosphere—extreme temperature
variation: 127o to -173o C
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Moon
• 3475 km diameter
• Density ~ Earth’s mantle
http://www.astrosurf.com/cidadao/moon_99_03_01.jpg
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Meteor Impact
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Compression Wave
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Ejecta Rim
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Euler Crater
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Lunar Features
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Maria Formation
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Flood Basalt
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Lunar Exploration
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Footprint in lunar regolith
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Moon formation
http://www.psi.edu/hartmann/pic-cat/
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Impact of asteroid
http://www.psi.edu/hartmann/pic-cat/
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Ejecta from impact
http://www.psi.edu/hartmann/pic-cat/
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Coalesced to form Moon
http://www.psi.edu/hartmann/pic-cat/
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Moon was initially hot
http://www.psi.edu/hartmann/pic-cat/
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Moon by Apollo
17 CrewRight part of
photo is ‘dark side’that cannot be seen from Earth
http://spacekids.hq.nasa.gov/osskids/animate/moon.html
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Rayed Crater
http://cnr2.kent.edu/~manley/copernicus_crater_area.jpg
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Lab Starts this Week
• Room NS 017• Down the south stairs• Do not miss class the first week• Buy your lab manual and read the first lab• Do the prelab questions, because your lab
instructor may want you to hand them in