The Universe on the largest scales is both homogenous and isotropic. What this means, and how we know it, are the subject of this video. I also chat about some of the philosophical implications of this amazing idea, plus adding in a couple personal biases. This is the third 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 course will cover the current state of the science of Cosmology. Here are the topics of this video: Introductory Cosmology Chapter 02: Fundamental Observations Section 02: The Universe is Isotropic and Homogeneous Some things covered: What are homogeneity and isotropy? How can we measure them? How does the Cosmic Microwave Background apply to this? What does the Hubble Deep Field Survey add? What does this mean for the laws of physics? Why are we alone in the local universe?