(1) http://www.psrd.hawaii.edu/July98/spa.html
(2) http://en.wikipedia.org/wiki/Colonization_of_the_Moon
(3) http://www.space.com/scienceastronomy/moon_composition_010907.html
(4) http://www.sciencenews.org/articles/20040313/bob9.asp
(5) http://www.teachersdomain.org/3-5/sci/ess/eiu/extemp/
(6) http://marsrovers.jpl.nasa.gov/spotlight/spirit/20051121.html
(7) http://marsrovers.jpl.nasa.gov/mission/spacecraft_instru_minites.html
(8) http://en.wikipedia.org/wiki/Geology_of_the_Moon
(9) http://encarta.msn.com/text_761573665__1/Moon.html
(10) http://www.marsinstitute.info/rd/faculty/dportree/rtr/rs03-2.html
(11) http://science.howstuffworks.com/mars-rover6.htm
(12) http://en.wikipedia.org/wiki/Far_side_(Moon)
(13) http://solarsystem.nasa.gov/scitech/display.cfm?ST_ID=252
(14) http://www.astro.virginia.edu/class/oconnell/astr121/moontop.html
(15) http://solarsystem.nasa.gov/multimedia/display.cfm?IM_ID=802
(16) http://www.frc.ri.cmu.edu/projects/lri/Luna/report/des_approach.html#REF61557
(17) http://www.solarviews.com/eng/moon.htm
(18) http://marsrovers.jpl.nasa.gov/mission/spacecraft_rover_temp.html
(19) http://www.psrd.hawaii.edu/Dec96/IceonMoon.html