- Is it possible to build a cannon that could launch a 1kg projectile into orbit? What would such an orbital cannon look like? http://what-if.xkcd.com/58/ 326 comments askscience
- What If: Orbital Speed http://what-if.xkcd.com/58/ 78 comments space
Linking pages
- Earth-Moon Fire Pole https://what-if.xkcd.com/157/ 75 comments
- LA to Vegas in 52 Seconds https://www.planet.com/pulse/la-to-vegas-in-52-seconds/ 0 comments
- Chris Hadfield meets Randall Munroe: ‘Are we alone in the universe?' | Space | The Guardian http://www.theguardian.com/lifeandstyle/2015/nov/28/conversation-chris-hadfield-randall-munroe-interview 0 comments
- Visit Every State https://what-if.xkcd.com/113/ 0 comments
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