Sources
http://www.popsci.com/science/article/2013-03/deep-space-engines
http://science.howstuffworks.com/solar-sail1.htm
https://www.nasa.gov/centers/glenn/about/fs21grc.html
https://www.sciencelearn.org.nz/resources/393-types-of-chemical-rocket-engines
http://ansnuclearcafe.org/2013/03/27/nuclear-pulse-propulsion-gateway-to-the-stars/#sthash.wPihULmk.dpbs

Pictures
http://www.wallpaperup.com/309938/shuttle_sky_start_Atlantis_spaceship_sci-fi_nasa.html
https://www.google.com/search?q=spaceship+propulsion&safe=active&espv=2&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiuj6fwnrvTAhUXHGMKHXkIB7oQ_AUICCgB&biw=1536&bih=736#imgrc=kRQMbXhk3vk65M:
http://www.popsci.com/bill-nyes-solar-sail-hits-few-snags-but-is-almost-ready-to-fly
https://fineartamerica.com/featured/orion-drive-spacecraft-using-atomic-rhys-taylor.html
http://www.orionsarm.com/eg-topic/49350e2d34113

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