Elon Musk @elonmusk
@Erdayastronaut @ValkyrieBaron11 @flcnhvy @NASASpaceflight A fully & rapidly reusable orbital rocket is fundamental to extending life beyond Earth. Propellant cost is roughly a 1000th of vehicle cost (unless using a foolish propellant). Same principle as cars, planes, boats, etc. — PolitiTweet.org
