Prospects for further lunar exploration and lunar habitation are discussed by E. Burgess, in Outpost on Apollo's Moon (Columbia University Press, New York, 1993). An excellent introduction to the Red Planet is M. Caiden and j. Barbree with S. Wright, Destination Mars (Penguin Putnam, New York, 1997).
Many college-level astronomy texts summarize current knowledge of small solar-system bodies and outer-solar-system environments. Especially notable and readable is E. Chaisson and S. McMillan, Astronomy Today, 3rd edn (Prentice-Hall, Upper Saddle River, NJ, 1999). For the most up-to-date information on solar-system exploration, consult popular astronomy magazines such as Astronomy and Sky & Telescope.
Prospects for free-space habitats is discussed by G.K. O'Neill in The High Frontier (Morrow, New York, 1977). Use of solar-system resources to support these future facilities is further investigated by B. O'Leary, in The Fertile Stars (Everest House, New York, 1981).
Lots of information on planets of other stars is included in P. Gilster's non-technical Centauri Dreams (Copernicus, New York, 2004), which also discusses other possible means of reaching the stars.
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