This is the very first of the videos in my new series of Cosmology. I'm going through Dr. Barbara Ryden's textbook "Introduction to Cosmology". I used this textbook at William Paterson University. This is a re-release of an earlier video that fixes some errata. This course will cover the current state of the science of Cosmology. Here are the topics of this video: Introductory Cosmology: Chapter 01. What is Cosmology? What is Cosmology? Units of Distance Units of Mass Units of Time Units of Energy and Power The Very Small Fundamental Constants of Nature Planck Units Gemetrized Units The Briefest History of Cosmology How did the Universe begin? Why are we here? When will it all end? What’s it made out of? What’s it’s fate? What’s the meaning of it all? How can we learn anything about any of these questions? Textbook:.