Essays and Manifestos
Links
Space and Human Survival (Sylvia Engdahl)
http://www.sylviaengdahl.com/space/survival.htm
An essay by science fiction author Sylvia Engdahl on why colonizing space is essential to human survival.
Space and survival - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Space_and_survival
Encyclopedia article on the relationship between the colonization of space and the long-term survival of the human species.
Space Colonization and SETI
http://www.bigear.org/vol1no2/oneill.htm
Interview with Gerard K. O'Neill by John Kraus of COSMIC SEARCH.
Space Quotes to Ponder
Over 100 brief quotations explaining why expansion of civilization into space is essential to the future survival and evolution of humankind.
Spaceflight or Extinction
Manifest page with links to scientists advocating space colonization.
Syliva Engdahl on space
http://www.sylviaengdahl.com/space.htm
Essays, quotes, and a radio interview from science fiction author Sylvia Engdahl, about the importance of expanding beyond Earth.
The Big Picture
http://members.aol.com/ramjetwww1/private/Space/Young.html
Essay by astronaut John Young about the need to preserve our species by putting humans permanently on the moon and Mars.
The Case for Space Colonization Now
Detailed argument for space colonization by Oscar Falconi.
The Greater Earth Manifesto
http://www.greaterearth.org/ge_manif.htm
A strong statement on the human space imperative by a group of European organizations.
The Preparation: Space Colonization
Detailed discussion by Rex Stephens about his book on the need for space colonization, asteroid mining, and transhumans.



