One of NASA's greatest achievements was the collaborative launch of the International Space Station (ISS). Because the human body can't live in space, engineers needed to study the effects of long-term space living on the human body before astronomers are sent on longer missions. For this reason, the ISS was established. It measures 365 feet (108.5 meters) by 238.8 feet (72.8 meters) and weighs 450 tons. The astronomers in the space station have studied human bone loss after an extended time in a low-gravity environment; they've also experimented with protection methods against various levels of radiation in space and tested ways to repair equipment, including soldering, while in space. The ISS isn't the first space station, but it's the longest-lasting and the most sophisticated.
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