1. 6.1MODERN COSMOLOGY 2. Olber’s ParadoxWhy is the sky dark at night?Most astronomers believed the universe was infinite.If that was so, then every line of sight should…

WHAT IS A GALAXY? WHAT IS A GALAXY? What does it consist? I. HISTORY Milky Way-âGalaxies kuklosâ In Greek mythology, Zeus places his son born by a mortal woman,…

WHAT IS A GALAXY? WHAT IS A GALAXY? What does it consist? I. HISTORY Milky Way-âGalaxies kuklosâ In Greek mythology, Zeus places his son born by a mortal woman,…

Slide 1 Parameterizing the Age of the Universe The Age of Things: Sticks, Stones and the Universe http://cfcp.uchicago.edu/~mmhedman/compton1.html Slide 2 WARNING! Cosmologist…

Slide 1 Slide 2 M 51 Slide 3 Galaxy merger simulation Slide 4 Slide 5 Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Slide 11 Slide 12 Discussion What do you think is going to…

Parameterizing the Age of the Universe The Age of Things: Sticks, Stones and the Universe http://cfcp.uchicago.edu/~mmhedman/compton1.html WARNING! Cosmologist talking about…

Chapter 20 Galaxies Determining Distance Measuring distances to galaxies: We measure galaxy distances using a chain of interdependent techniques Step 1 Determine size of…

Hubble’s Law Edwin Hubble (1889-1953) Measured distances to nearby galaxies using Cepheid variables Galaxies are islands of stars Developed a classification scheme for…

Galaxy Distances - Then and Now Brent Tully, University of Hawaii with the essential collaboration of Rick Fisher, Ed Shaya, and Helene Courtois “I have now been able to…

Anton Tikhonov /Saint-Petersburg State University Anatoly A. Klypin /New Mexico State University Properties of voids in the Local Volume and the Limit of appearance of a…