PDF-(BOOK)-Beyond The Galaxy: How Humanity Looked Beyond Our Milky Way And Discovered The

A look up at the night sky reveals a treasury of wonders Even to the naked eye the Moon stars planets the Milky Way and even a few star clusters and nebulae illuminate the heavens For millennia humans struggled to make sense of whats out there in the Universe from all we can see to that which lies beyond the limits of even our most powerful telescopes Beyond the Galaxy traces our journey from an ancient Earthcentered Universe all the way to our modern 21st century understanding of the cosmos Touching on not only what we know but also how we know it Ethan Siegel takes us to the very frontiers of modern astrophysics and cosmology from the birth of our Universe to its ultimate fate and everything in between. The Milky Way Galaxy. When you look into the hazy band of light across the sky, you are actually looking at our galaxy from the inside. While an awesome sight, you can only truly begin to see it if you get away from city lights on a moonless night. . 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. . Problems. Ch-23. 1. . An astronomer looking through the . Hubble Space Telescope. can see a star with solar luminosityw at a distance of 100,000 pc. The brightest Cepheids have luminosities 30,000 times greater than that of the Sun. Taking the Sun’s absolute magnitude to be 5, calculate the absolute magnitudes of these bright Cepheids. Neglecting interstellar absorption, how far away can . http://www.pa.uky.edu. Only 10% of the class has completed the evaluations so far.. I will add 5 points on your final exam if you complete the evaluation.. Today’s model for the formation of the Milky Way and other galaxies. 23.1 Our Parent Galaxy. 23.2 Measuring the Milky Way. Early “Computers”. 23.3 Galactic Structure. 23.4 The Formation of the Milky Way. 23.5 Galactic Spiral Arms. Density Waves. 23.6 The Mass of the Milky Way Galaxy. 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:. megaparsecs. away be moving with respect to us, according to Hubble’s Law? Hint: H. 0. = 70 km/s/. Mpc. 1,400 km/s. 14,000 km/s. 140,000 km/s. 140 km/s. How fast would a galaxy 2,000 . megaparsecs. 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.. Lecture 2; . April 9 2013. Previously.. On Astro-2. The goal of cosmology is to understand how the universe formed and evolved.. How can we build a theory of the universe valid at all times in every place? . Now what country…. W. hat continent…. W. hat planet…. W. hat galaxy?. After today’s lesson, you should be able to answer all of these questions and more!. How is our solar system positioned in the milky way galaxy and the universe?. 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). Chapter 21. How does distance affect an image?. Telescope- device that makes an object in the sky appear closer.. Revolutionized astronomy (study of space)- allowed them to see objects in space for first time.. homgeneity. of the universe.. 2. understand how Hubble’s law is used to map the universe, and look back in time.. 3. Know each of the major predictions of the Big Bang theory, and corresponding confirmations by observation..