- Life on Other Worlds (Out of This World) by Ray Spangenburg, Kit Moser, 2002-09
- Is There Life on Other Worlds? by Poul Anderson, 1968-06
- Living on Other Worlds (Our Universe) by Gregory Vogt, 2000-03
- Strangers in the Night: A Brief History of Life on Other Worlds (Cornelia & Michael Bessie Series) by David E. Fisher, Marshall Jon Fisher, 1998-11
- Other worlds than ours: The plurality of worlds studied under the light of scientific researches by Richard A Proctor, 1902
- Drifting on Alien Winds: Exploring the Skies and Weather of Other Worlds by Michael Carroll, 2011-02-01
- Planetology: Comparing Other Worlds to Our Own (Venture Books - Science) by Fred Schaaf, 1997-03
- The Search for other Worlds: Fourteenth Astrophysics Conference (AIP Conference Proceedings / Astronomy and Astrophysics)
- Life in the Universe: From the Miller Experiment to the Search for Life on Other Worlds (Cellular Origin, Life in Extreme Habitats and Astrobiology)
- Other Worlds: A Beginners Guide to Planets and Moons by Terence Dickinson, 1995-09-01
- Life on Other Worlds and How to Find It (Springer Praxis Books / Space Exploration) by Stuart Clark, 2000-03-15
- Life on Other Worlds: The 20th Century Extraterrestrial Life Debate by Steven J. Dick, 2001-02-15
- The Planet Hunters: The Search for Other Worlds by Dennis Brindell Fradin, 1997-10-01
- The sidereal heavens,: And other subjects connected with astronomy, as illustrative of the character of the Diety and of infinity of worlds by Thomas Dick, 1845
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