제 목    jhsLrWaxpRilZuUmXU 이 름    Cedrick 날 짜    2018/06/29 조 회    1 How much is a Second Class stamp? para que sirve el ciprofloxacino yahoo The shuttle program continued, and its goals evolved. After struggling through many different design iterations, NASA and several other countries began work on the International Space Station (ISS), which would go on to become one of the most expensive construction projects in the history of the world. The ISS relied on the lifting capacity of the Space Shuttle fleet to move its parts into orbit (though a station of similar mass could have been lofted by just five Saturn V rockets rather than the dozens and dozens of shuttle flights necessary). More than twice as many spacewalks than had previously occurred in the entire history of space flight were required to bolt the ISS's modules together. The station slowly grew from a pair of docked modules to a sprawling complex bigger than an American football field.