Content
15.1: Milky Way Galaxy
15.2: Properties of galaxies
15.3: Clusters of galaxies
15.4: Peculiar galaxies
Chapter 1 : The Universe at different scales
Chapter 2 : The earth and the sky
Chapter 3 : Lunar phases, tides and eclipses
Chapter 4 : The origin of modern astronomy
Chapter 5 : Theory of motion and gravitation
Chapter 6 : Relativity
Chapter 7 : The solar system
Chapter 8 : Measuring stars
Chapter 9 : The sun
Chapter 10 : The formation of stars
Chapter 11 : Stellar evolution
Chapter 12 : The deaths of stars
Chapter 13 : Neutron stars
Chapter 14 : Black holes
Chapter
15 : Galaxies
Chapter 16 : Cosmology