If you happen to like our videos and have a few bucks to spare to support our efforts, check out our Patreon page where we've got a variety of perks for our Patrons, including Simon's voice on your GPS and the ever requested Simon Whistler whistling package: https://www.patreon.com/TodayIFoundOut →Some of our favorites: https://www.youtube.com/playlist?list=PLR0XuDegDqP10d4vrztQ0fVzNnTiQBEAA →Subscribe for new videos every day! https://www.youtube.com/user/TodayIFoundOut?sub_confirmation=1 Never run out of things to say at the water cooler with TodayIFoundOut! Brand new videos 7 days a week! More from TodayIFoundOut How the Himalayas Formed https://youtu.be/GfxjSU57fAk?list=PLR0XuDegDqP01NqW8KRpOy-_y2m6S2VEF How the Moon was Formed https://youtu.be/MPmqxlFdw-8?list=PLR0XuDegDqP01NqW8KRpOy-_y2m6S2VEF In this video: Whether it’s two-strokes or four, one cylinder or eight, most of the engines we use today are powered by the internal combustion of fuel and air; however, mixing gasoline and oxygen isn’t the only way to generate the energy needed to propel a craft, and in fact, sometimes it’s the least efficacious choice. Want the text version?: http://www.todayifoundout.com/index.php/2015/03/lunar-landers-re-launch-theres-no-oxygen/ Sources: http://en.wikipedia.org/wiki/Air%E2%80%93fuel_ratio http://www.nasa.gov/mission_pages/apollo/missions/#.VMtvicaWTwJ http://en.wikipedia.org/wiki/Ascent_Propulsion_System http://auto.howstuffworks.com/engine2.htm http://www.hq.nasa.gov/pao/History/SP-4205/ch6-5.html http://curious.astro.cornell.edu/question.php?number=8 http://en.wikipedia.org/wiki/Hypergolic_propellant http://auto.howstuffworks.com/engine1.htm http://en.wikipedia.org/wiki/Liquid-propellant_rocket http://www.astronautix.com/craft/lmalsion.htm http://en.wikipedia.org/wiki/Motorcycle_engine#Cylinders_and_configuration http://history.nasa.gov/conghand/propelnt.htm http://history.nasa.gov/conghand/propulsn.htm http://www.new