Yesterday in Los Angeles, the only complete Space Shuttle stack on public display opened to visitors. Endeavour standing on its real boosters and external tank, 200 feet tall. The same day, Starship reached orbit from Texas and put 26 Starlink V3 satellites in space. The Shuttle was called reusable. The external tank was thrown away on every flight, and the boosters were fished out of the ocean and rebuilt. Between missions the orbiter needed months of work. 135 flights, about $209 billion, roughly $1.5 billion per launch. Starship is designed so both stages fly back to the tower and go again within hours. Reuse like an airplane is the only way flights get cheap enough to build a city on Mars, and Elon Musk has been aiming at exactly that since 2002.