Lecture09 - Astro Nova USA-193 Spy Satellite visibility...

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Astro Nova USA-193 Spy Satellite visibility 02/19 06:12 pm 4 min 14° SW 64° N 10° NE 02/20 06:04 pm 4 min 11° WSW 39° NW 11° NNE Space Station module Columbus installed 3 solar instruments to monitor Sun’s brightness European Space Agency experiment Asteroid 153951 discovered to have 2 moons Arecibo radar observation doesn’t cross Earth’s orbit each moon ~1/6 size of main body
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Lunar Eclipse Tomorrow! Feb. 20, 10 – 11 pm totality 40 th Anniversary of “Mr. Rogers Neighborhood”
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Previous Lecture Nuclear energy in stars in cores of stars where temperature and density are large hydrogen fusion into helium proton-proton chain at low mass CNO cycle at high mass Energy Transport radiation convection Stellar Models Voigt-Russell theorem main sequence is a mass sequence stability of main sequence stars
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Quiz Question 1 How many balloons were popped in last Thursday’s lecture? A. 0 B. 1 C. 2 D. 3 E. 4
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Quiz Question 2 Why does fusing hydrogen into helium produce energy? A. Because the reactions only occur at high temperature B. Because the reactions only occur at high density C. Because the mass of the helium nucleus is greater than the mass of 4 hydrogen nuclei D. Because the mass of the helium nucleus is less than the mass of 4 hydrogen nuclei E. It doesn’t – it consumes energy produced by gravitational contraction
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Quiz Question 3 In regions inside stars where convection occurs: A. Most of the energy is transported by photons B. Most of the energy is transported by neutrinos C. Most of the energy is transported by electric
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Lecture09 - Astro Nova USA-193 Spy Satellite visibility...

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