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10.29.2007 Astronomy Notes

10.29.2007 Astronomy Notes - Structure-Core nuclear fusion...

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10.29.2007 – Astronomy Extra solar Planets - Direct imaging (difficult) - Eclipsing - Doppler Effect (most used) Is our solar system unique? Selection effects: - Jupiters at Jovian distances are harder to detect because they are far away and tug on the star less and they take a long time to detect - We couldn’t detect solar systems like ours until very recently - There are two types of solar systems: (jupiters form at Jovian distances) o Undisturbed o Disturbed Stars The Sun : about 30 arc minutes across (half a degree); radius about 100 earths; 332,000 earth masses; 28x earth surface gravity; rotation varies at latitude and depth (slowest at poles, fastest at equator)
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Unformatted text preview: Structure:-Core: nuclear fusion, 200,00km thick. Most of the mass, most dense region-Radiation zone: temp is hot enough that gases are ionized (no atoms). 300,000km thick. takes 200,000 years for light to get out-Convection zone: 200,000 km. temp drops so that gases are atomic, changes flow of energy. -Photosphere: 500 km. visible surface of the sun-Chromosphere: 1500 km. transparent, part of atmosphere-Transition zone: 8500 km. part of atmosphere-Corona-Solar wind Interior Standard solar model: photosphere observation – helioseismology GONG – ground based SOHO – space based Model good to about 0.1%...
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