Space+Travel+Links

How? http://library.thinkquest.org/03oct/02144/start/prob.htm

Basic needs of astronauts: http://library.thinkquest.org/03oct/02144/start/prob.htm

Manned missions to Mars: http://library.thinkquest.org/03oct/02144/start/prob.htm

Space elevators: http://www.howstuffworks.com/space-elevator.htm

Solar sails: http://science.howstuffworks.com/solarsail5.htm

Mars Mission simulation: http://mars500main.appspot.com/#en