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My revision videos on other topics:    • A Level Physics Revision Videos  
My full online lessons on Cosmology and Astrophysics:
   • Astrophysics and Cosmology  

More on Dark Matter and Dark Energy:
   • What is Dark Matter and Dark Energy?  

Chapters:
00:00 Intro
00:10 Units
01:05 Parallax and parsecs
05:37 The Cosmological Principle
06:03 The Doppler Shift
08:36 Hubble's Law
10:48 Converting Hubble's constant
12:26 Age of the universe
14:11 The Big Bang Theory
15:34 Cosmic Microwave Background Radiation
16:17 Dark Energy and Dark Matter