PPT-Assembling the Milky Way

David Spergel What has changed Context Standard cosmological model No galaxy is an island John Dunne vs Immanuel Kant Tools Statistical galactic astronomy 100s of stars gt 100000s gt 1e9 GAIA LSST. Lec21: The Milky Way The Milky Way GalaxyLecture 21APOD Lec21: The Milky WayAtomic, molecular, and ionized gas Lec. 21: The Milky Way21 -2 Lec21: The Milky Way Considering the . UN. derlying. Problems. UN-Faithful. Romans 10:17. “Faith comes . by hearing . and hearing . by the . word of God.”. Our faith must be based solely on the word of God.. To do something not authorized by God’s word is unfaithful. We are guilty of committing a sin.. Considering the . UN. derlying. Problems. UN-Faithful. Romans 10:17. “Faith comes . by hearing . and hearing . by the . word of God.”. Our faith must be based solely on the word of God.. To do something not authorized by God’s word is unfaithful. We are guilty of committing a sin.. Considering the . UN. derlying. Problems. UN-Reliable. Matthew 25:21. “His lord said to him, ‘Well done. ,. good and faithful servant; you were . faithful over a few things. , I will make you . Recap. Canvas homework: due on Wednesday. Lab this week: Galaxy Morphology. Campus Observatory. Milky Way galaxy. Stars: . brightnesses. , masses, sizes, compositions, evolution. Interstellar matter: gas, dust. William Herschel’s map of the Milky Way based on star counts. In the early 1800’s William Herschel, the man who discovered the planet Uranus, tried to understand the shape of the Milky Way by counting stars. He counted how many stars there were in each of dozens of different directions and then plotted the count versus direction. . The Milky Way: Our Home Galaxy. What are the different. components of the Milky Way?. How do we see those components?. What does a map of each component look like from our point of view?. Stars in the Milky Way. Spiral Structure. . The Astronomical Context. By the 1920’s, we knew that the once-mysterious spiral nebulae were flattened galaxies. . Our Milky . Way is . also. flattened. . Two obvious . questions arose:. Our Place Within It. . . The Visible Milky Way. The Milky Way as Seen From Texas. (from Canada, we can. ’. t see the Southern Cross). The Obvious Questions. How big is the Milky Way, and where are we located? At the . bye:. Angelina Battle. The legend of The Milky Way. This is what old people told me when I was a child. Long ago, when the world was new, there were not many stars in the sky. In those days people depended on corn for their food. They would grind it and keep it in bins behind their homes. Bread made from cornmeal, often kept them from starving during the long winter months. . Contains more than 100 billion stars. Is one of the two largest among 40 galaxies in the Local Group. Our Solar System is located a little more than half way from the galactic center to the edge of the galactic disk.. AND TESTING . COMPUTERS. EXAMPLE: 3.1 ASSEMBLING AND TESTING COMPUTERS. The PC Tech company assembles and then tests two models of computers, . Basic. and . XP. . . For . the coming month, the company wants to decide how many of each model to assembly and then test. . Here’s the mystery story we’ll unfold…. Fuzzy blobs in the sky – new solar systems, or “galaxies”?. Observational tests. Herschel’s map of the “universe” . (what we today know as just our Galaxy). Pedagogical experience with hydrostatic weighing system Farias, E.C.C . , Aibe, V.Y. , Araujo, S.B. INMETRO, Rio de Janeiro, Brazil, ecfarias@inmetro.gov.br INMETRO, Rio de Janeiro, Brazil, vyaibe@i