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Astronomy Notes for Exam 2

Astronomy Notes for Exam 2 - Study Session for Astronomy...

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10/26/2010 Study Session for Astronomy Exam 2 “SUN” REVIEW SOHO Orbits the Sun, not the Earth SUN 4 ½ billion years old Powered by Nuclear Fusion Cross Section of Galiled or Palisto looks like Ice Covered Rock / Heavily Cratered Cross Section of Comet looks like Ice/Rock Mix “Dirty Snowball Europa – Smooth cracked ice…Hoping to find liquid ocean What rules out the SUN being alive? No cell structure/skin What rules out chemical burn? Won’t last long enough Nuclear Fusion fuel: Hydrogen, which produces Helium What’s unusual about the change from Hydro to Helium? You end up with less mass The mass changes into energy E=Mc^2 C stands for the speed of light in space Size of SUN Layers of the Sun (6) Bottom layer of sun = Core Above that = Radiation Zone Fusion takes place above the core, or the bottom of the radiation zone Because of high pressure and high temperature Moons of Jupiter Io would have to be as close as the roche limit, and then the tides of Jupiter would pull it apart
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NEW NOTES: Temp. of the Photosphere (visible surface) = 5800 Celsius or 10,000 degrees Fahrenheit
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