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Lecture 20 - Dark Matter

This video was recorded at ASTR 160 - Frontiers and Controversies in Astrophysics. This lecture introduces an important concept related to the past and future of the universe: the Scale factor, which is a function of time. With reference to a graph whose coordinates are the Scale factor and time, the problem of dark matter is addressed again. Cosmological redshifts are measured to determine the scale of the universe. The discovery of the repulsive, anti-gravitational force of dark energy is explained. The lecture concludes with discussion of Einstein's biggest mistake: the invention of the cosmological constant to balance gravity. Reading assignment: Problem Set 7 [PDF] Problem Set 7 Solutions [PDF] Resources Class Notes - Lecture 20 [PDF]

Keywords:: videolectures, ocwc, oec

Disciplines:

Science and Technology / Astronomy

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Material Type:: Presentation
Date Added to MERLOT:: February 10, 2015
Date Modified in MERLOT:: February 10, 2015
Author:: Charles Bailyn, Department of Astronomy, Yale University
Submitter:: The Open Education Consortium
Primary Audience:: College General Ed, College Lower Division, College Upper Division
Technical Format:: Video

Mobile Compatibility:: Not specified at this time
Language:: English
Cost Involved:: No
Source Code Available:: No
Accessibility Information Available:: Unknown
Creative Commons:: This work is licensed under a Attribution-NonCommercial-NoDerivs 3.0 United States