This week's short lecture is just a brief overview of General Relativity. You're going to have to spend some serious time in the text to get to the nitty-gritties. 

Remember, the purpose of these topics on Relativity (both Special and General) is get you up to speed on the true nature of space and time,  or as we in cosmology say, "spacetime." 

The Launchpad homework assignment that goes with this lecture is based on chapter 12, section 11.

Take your time and READ!

(1) Pages 58-59

(2) Follow up with this:

(3)   Here is a lecture/topic from the Physics course that is relevant in Astronomy. Before you start the video download these modified pages from the Physics Workbook to make it easier to follow the lecture.