Annotations:
Mars Colony Plans? https://youtu.be/N1aggLqdbd0
Terraforming https://youtu.be/9F1iWp4Gl3k
Sending People to Mars https://youtu.be/vw09bLwd3Ak
Let’s Go To Mars https://youtu.be/NiCDQ_91Pks
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Sources:
http://nineplanets.org/venus.html
http://nssdc.gsfc.nasa.gov/nmc/masterCatalog.do?sc=1981-106D
Exploring Venus By Airship: Cool Concept, But Certainly Not New
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20110016033.pdf
http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1634&context=smallsat
http://www.space.com/28081-nasa-vision-for-venus-havoc-airships-video.html
Images:
https://commons.wikimedia.org/wiki/File:Mars_colony.jpg
https://commons.wikimedia.org/wiki/File:Venus-real_color.jpg
https://commons.wikimedia.org/wiki/File:Maat_Mons_on_Venus.jpg
https://commons.wikimedia.org/wiki/File:NASA_Cloud_City_on_Venus.jpg
https://commons.wikimedia.org/wiki/File:Fram_Crater_in_color.jpg
https://commons.wikimedia.org/wiki/File:Venera_13.jpg
https://commons.wikimedia.org/wiki/File:Venusatmosphere.svg
https://commons.wikimedia.org/wiki/File:Congrats_bqt.jpg
https://youtu.be/0az7DEwG68A