Watch 'xkcd' explain space travel using the simplest words possible
by Mark Frauenfelder from on (#TD3W)
"Rocket" is not one of the 1,000 most common words in the English language, so it's called an "up goer" in the excellent xkcd video that explains space travel in simple terms. It's adapted from xkcd creator Randall Munroe's book, Thing Explainer: Complicated Stuff in Simple Words."