1. For the definition of albedo we refer the reader to the Glossary, whereas for further physical parameters the appropriate reference is: Ross Taylor, S. (1999) The Moon, in P. R. Weissman, L.-A. McFadden and T. V. Johnson (eds.), Encyclopedia of the Solar System, Academic Press, San Diego, pp. 247–275.
2. Ponnamperuma C. (1995) The origin of the cell from Oparin to the present day, in Ponnamperuma, C. and Chela-Flores, J. (eds.), (1995) Chemical Evolution: The Structure and Model of the First Cell, Kluwer Academic Publishers, Dordrecht, pp. 3–9.
3. Cf. Glossary: “breccia”, basalt and “arnothosite”; a remarkable Apollo 16 sample of arnothosite was assigned an age of approximately 4440 Myr; cf., also Gibson,, E. K. and Chang, S. (1992) The Moon: Biogenic elements, in G. C. Carle, D. E. Schwartz and J. L. Huntington (eds.), Exobiology in Solar System Exploration, NASA SP 512, pp. 29–43.
4. Britt, D. T. and Lebofsky, L. A. (1999) Asteroids, in P. R. Weissman, L.-A. McFadden and T. V. Johnson (eds.), Encyclopedia of the Solar System, Academic Press, San Diego, pp. 585–605.
5. Campins, H. (2000) The chemical composition of comets, in Chela-Flores, J., Lemarchand, G.A. and Oro (eds.), J. (2000). Astrobiology: Origins from the Big Bang to Civilisation, Kluwer Academic Publishers, Dordrecht, The Netherlands, pp. 163–176.