IMAGE_CREDITS.txt

* images/generic/colony/surface/cratered/equipment_cratered

Photo of Mars, courtesy of Nasa/CC Public Domain

* images/generic/colony/surface/desert/equipment_desert

http://krictic.deviantart.com/art/Desert-Planet-Experiment-1-252137767

* images/generic/colony/surface/rocky/equipment_rocky

Photo of Mars, courtesy of Nasa/CC Public Domain

* images/generic/colony/surface/frozen/equipment_frozen

http://en.wikipedia.org/wiki/File:EN003_Enceladus_Mosaic.jpg Nasa/JPL Public Domain

* images/generic/colony/surface/liquid/equipment_liquid

http://www.4freephotos.com/download.php?image=c304346e8ab85c34a5d0db52e64d3311&file=u/Earth-Oceania318.jpg Creative Commons

* images/generic/colony/surface/neptoplasm/equipment_neptoplasm

http://tracinguniverse.blogspot.hu/2011/12/dead-planet-mercury.html Creative Commons