Lecture06 - Astro Nova Annular Solar Eclipse Yesterday...

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Astro Nova Annular Solar Eclipse Yesterday evening 10:44 pm Antarctica Total Lunar Eclipse, Wednesday Feb. 20, 10 11 pm New solar cycle begins First sunspot with reverse polarity seen
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Previous Lecture Hertzsprung Russell Diagram (or color-magnitude diagram, CMD) fundamental tool for understanding stars luminosity plotted against color main sequence, giants, supergiants, white dwarfs Mass-luminosity relationship Sun properties photosphere and limb darkening sunspots and active cycle energy source
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Homework Question CQ 8: Why is nearly all of the Sun’s energy produced in the inner 1.5% of its volume? A. Because the rate of nuclear reactions depends strongly on temperature and density B. Because the heaviest elements have sunk into the Sun’s core. C. Because gravity is strongest at the center of the Sun. D. Because only in the core is there enough oxygen to feed the chemical reactions E. Because this keeps pollution from solar power plants out of the Sun’s atmosphere
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Homework Question CQ 3: Why does it take so long for the energy produced in the Sun’s core to reach the surface? A. Light travels slower in the Sun than in space. B. Most of the Sun is very opaque to light. C. The Sun’s gravity traps the photons. D. Because the Sun is so large, it just takes that amount of time for the light to travel the distance from the core to the surface. E. Convection slows the motion of photons.
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Quiz Question 1 To get a meaningful HR Diagram, you must plot which two properties of a star?
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