Additional videos to watch before Lecture 2:
Interactive scale of the Universe: http://htwins.net/scale2/
1) Scale of the Universe video:    • How Big Is The Universe?  
2) Star sizes video:    • STARS Dimensions | MetaBallStudios  
3) Asteroid discovery video:    • Asteroid Discovery  19702015  8K r...  
4) The most astounding fact video:    • The Most Astounding Fact  Neil deGra...  
5) Why is the milk gone video:    • Why is the Milk Gone?  
6) You are here video:    • Carl Sagan and the Pale Blue Dot  "Y...  

This is the first video I have recorded in quite some time. I apologize for the excess "uhm" and "uhh" sounds. Those should be worked out in time!