The hypothetical idea of creating an Earthlike environment on another planet. Some scientists believe that astronauts could create an oxygenated atmosphere that would make Mars and other planets inhabitable.
http://library.thinkquest.org/10274/ View of what a colony on Mars might look like in 2050. Navigate around the fictional Martian colony, Koinae, learning about daily life, the climate, terrain, and research projects on Mars.
http://www.users.globalnet.co.uk/~mfogg// Good selection of essays and articles about terraforming the planets. The site has a gallery with space art depicting terraformed planets, as well as links to terraforming resources on the Internet and a comprehensive bibliography.
Subjects: Literature — Astronomy and Astrophysics.