"Lec 16 - Hubble's Law and the Big Bang" Frontiers/Controversies in Astrophysics (ASTR 160) The third and final part of the course begins, consisting of a series of lectures on cosmology. A brief history of how cosmology developed into a scientific subject is offered. The discovery of dark energy, along with dark matter, played a crucial role in the development of cosmology. The lecture then discusses the discovery of spiral nebulae in 1920, as well as the "Great Debate" over what they were. Hubble's famous redshift diagram is presented as the basis for Hubble's Constant and Big Bang cosmology. The difficulty of measuring distance of objects in space, and how to do it using the parallax method and the standard candle method, are discussed. Measure brightness using the magnitude scale is explained. Class ends with a review of logarithms. 00:00 - Chapter 1. Introduction to Cosmology 03:34 - Chapter 2. Spiral Nebulae and Hubble's Redshift Diagram 17:35 - Chapter 3. Measuring the Distance of a Star: The Parallax Method 25:13 - Chapter 4. Measuring Brightness: The Standard Candle Method 38:06 - Chapter 5. Absolute and Apparent Magnitude 48:04 - Chapter 6. Conclusion Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses This course was recorded in Spring 2007.

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Channels: Astrophysics

Tags: absolute magnitude apparent Big Bang cosmology dark energy distance ladder Doppler shift Edwin Hubble galaxy Great Debate Harlow Shapley diagram Hubble's constant island universe logarithm scale Milky Way nebula parallax method parsec Sirius spiral standard candle Vega

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