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The Sun's Crowded Delivery Room
The Sun's Crowded Delivery Room

... Sun, form in clusters • Meteorite studies can test this idea and give additional information about events leading to formation of the Solar System ...
The Hertzsprung-Russell diagram and the nature of stars
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... How can we know the structure of the Sun below the photosphere? • Application of the laws of physics (equations of stellar structure), find solution consistent with mass and radius of Sun • Measure “eigenmodes” of the Sun (see how fast it jiggles • Results for how the sun is put together ...
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OP/IP27 Stars HR life of stars WS

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Astroparticle physics 1. stellar astrophysics and solar neutrinos

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... and toroidal field. These relate to the sunspots , CMEs, flares and so on. The magnetic pressure and tension should be stronger than them in the atmosphere. But the gas pressure should also be stronger, so β not necessarily be small. ...
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Solar Energy Module PowerPoint

... The surface of the Sun, called the photosphere, is at a temperature of about 5800 K. Sunspots are "cool" regions, only 3800 K (they look dark only by comparison with the surrounding regions). Sunspots can be very large, as much as 50,000 km in diameter. Sunspots are caused by complicated and not ver ...
The Sun
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... from the Sun and found it to be lower than expected (by 30-50%) Confirmed in subsequent experiments Theory of p-p fusion well understood Solar interior well understood ...
PowerPoint Presentation - Welcome to Modern Astronomy Fall 2003
PowerPoint Presentation - Welcome to Modern Astronomy Fall 2003

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Exam 3 Solution Set - Indiana University Astronomy
Exam 3 Solution Set - Indiana University Astronomy

... and assume ρ = 1.3 gm cm-3 The value of the mean molecular weight depends on whether the hydrogen is ionized. If not, µ = 1; if so µ = 0.5. Calculate Tc assuming one or the other, and then decide. Or, you could remember that Jupiter might have a metallic hydrogen core, which would not be ionized…. T ...
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Astronomy 2 Relativity and Gravitation

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Week 5 - OSU Astronomy
Week 5 - OSU Astronomy

... – also carries heat outward – not as effective as convection because of high opacity. Light takes 10 million years to escape, instead of 2 sec, as for neutrinos ...
Brock physics - Brock University
Brock physics - Brock University

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Standard solar model

The standard solar model (SSM) is a mathematical treatment of the Sun as a spherical ball of gas (in varying states of ionisation, with the hydrogen in the deep interior being a completely ionised plasma). This model, technically the spherically symmetric quasi-static model of a star, has stellar structure described by several differential equations derived from basic physical principles. The model is constrained by boundary conditions, namely the luminosity, radius, age and composition of the Sun, which are well determined. The age of the Sun cannot be measured directly; one way to estimate it is from the age of the oldest meteorites, and models of the evolution of the Solar System. The composition in the photosphere of the modern-day Sun, by mass, is 74.9% hydrogen and 23.8% helium. All heavier elements, called metals in astronomy, account for less than 2 percent of the mass. The SSM is used to test the validity of stellar evolution theory. In fact, the only way to determine the two free parameters of the stellar evolution model, the helium abundance and the mixing length parameter (used to model convection in the Sun), are to adjust the SSM to ""fit"" the observed Sun.
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