1 Water on Earth, Properties of Water.- 2 Life and Water.- 3 Water on Planets and Dwarf Planets.- 4 Satellites of Planets in the Solar System.- 5 Water on Small Solar System Bodies.- 6 Water on Extrasolar Planets?- 7 Water in Interstellar Space and Stars.- 8 Water - Where does it Come From?.- 9 Appendix.