lecture09

lecture09 - Astronomy 3: The Nature of the Universe...

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Unformatted text preview: Astronomy 3: The Nature of the Universe Professor Alice Shapley Lecture 9: Jovian Planets (NGC 1499 Image credit: Markus Noller, Deep Sky Images) Logistics Quiz #4: due Monday, May 2nd, 10 pm. Available today after class at CCLE website Lab this week on: https://ccle.ucla.edu/course/view/11S-ASTR3-2 Midterm #1 Results Exam graded out of 50 points. Median score (i.e. halfway point): 41/50 (82%), mean=40.1 (80.2%). Midterm scores posted on-line after class. Midterm solutions posted soon. Come to me with questions. Midterm #1 Results 3 Hardest questions: Imagine we've discovered a planet orbiting another star at 1 AU every 6 months. The planet has a moon that orbits the planet at the same distance as our Moon, but it takes 2 months. What can we infer about this planet? a) It is more massive than Earth. b) It is less massive than Earth. c) It has the same mass as Earth. d) We cannot answer the question with the current information. p 2 4 2 GM 1 a 3 M 1 4 2 G a 3 p 2 Newtons version of Keplers 3 rd law: Midterm #1 Results 3 Hardest questions: If the moon is setting at 6 AM (i.e. around sunrise), the phase of the Moon is: a) first quarter b) full c) third quarter d) new e) waning crescent Midterm #1 Results 3 Hardest questions: According to Wien's law, how many times hotter is an object whose thermal emission spectrum peaks in the UV, at a wavelength of 200 nm, than an object whose spectrum peaks in the red, at 600 nm? a) 1.5 times b) 3 times c) 9 times d) 27 times e) 81 times Midterm #1 Results 3 Hardest questions: According to Wien's law, how many times hotter is an object whose thermal emission spectrum peaks in the UV, at a wavelength of 200 nm, than an object whose spectrum peaks in the red, at 600 nm? a) 1.5 times b) 3 times c) 9 times d) 27 times e) 81 times Interestingly enough, people did very well distinguishing that, qualitatively, a blue star has a hotter surface temperature than a red star. The quantitative difference, that peak wavelength (i.e. color) goes like 1/T, is also important! Extra Credit Two types of extra credit (1.5% each, for full credit): 1) Telescope Viewing Exercise. Go to the UCLA planetarium for a Wednesday night show (shows take place every Wednesday, 8:00 pm). Fill out worksheet linked at CCLE website. For more information about the UCLA planetarium, check out: http://www.astro.ucla.edu/planetarium 2) Griffith Observatory Visit. Go to Griffith Observatory, take a picture of yourself there, and write a 3-page report about your visit there, and what you learned. For more information about Griffith, check out: http://www.griffithobs.org/ Review from Last Time Terrestrial planet interiors. Core: metals such as nickel and iron....
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lecture09 - Astronomy 3: The Nature of the Universe...

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