Are Spaceplanes Possible?
Are Spaceplanes Possible? Despite many plans, prototypes, and experimental flights since, only two spaceplanes have ever entered service, the Space Shuttle and the top-secret Boeing X-37B. Only the small, unmanned Boeing remains in service. Is spacex Starship an SSTO? (Though when launching from the moon or Mars it’s no problem.) Previously in 2018 Musk had