I explain space guns, problems and solutions with space guns and also projects HARP and Babylon in this longest Explained: video yet. Hope you enjoy, and see you in another 2 months! I really hope you enjoy and learn something from this video, and leave any constructive criticisms and ideas for future videos below. Sources: http://www.astronautix.com/a/abriefhistoheharpproject.html http://www.astronautix.com/b/babylongun.html https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19980223621.pdf https://history.nasa.gov/afj/launchwindow/lw1.html http://www.au.af.mil/au/aupress/digital/pdf/book/b_0113_brulle_engineering_space_age.pdf https://www.newscientist.com/article/dn10180-huge-launch-ring-to-fling-satellites-into-orbit https://fas.org/nuke/guide/iraq/other/supergun.htm http://www.bbc.com/future/story/20160317-the-man-who-tried-to-make-a-supergun-for-saddam-hussein https://upload.wikimedia.org/wikipedia/commons/a/a5/South_Africa_Border_War_Map.png https://en.wikipedia.org/wiki/G-force#/media/File:Human_linear_acceleration_tolerance.svg https://www.youtube.com/watch?v=FUXIY1KzqOE The image of the V3 weapon was provided to Wikimedia Commons by the German Federal Archive. Space Photo by Egres73 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=29987109 Pentagon photo by David B. Gleason from Chicago, IL - The Pentagon, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=4891272 Cannon photo by Johann Jaritz - Own work, CC BY-SA 3.0 at, https://commons.wikimedia.org/w/index.php?curid=44206682 Photo of neglected HARP gun by Johnmartindavies - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=31217933