Lecture 2 of Leonard Susskind’s Modern Physics concentrating on Cosmology. Recorded January 19, 2009 at Stanford University. This Stanford Continuing Studies course is the fifth of a six-quarter sequence of classes exploring the essential theoretical foundations of modern physics. The topics covered in this course focus on classical mechanics. Leonard Susskind is the Felix Bloch Professor of Physics at Stanford University. Stanford University: www.stanford.edu Stanford Continuing Studies continuingstudies.stanford.edu About Leonard Susskind: www.stanford.edu Stanford University Channel on YouTube: www.youtube.com