NASA's space shuttles have racked up an amazing set of accomplishments over the last 30 years, not to mention the miles and statistics. But after three decades and 135 flights, the era of the NASA space shuttle is at an end. The final shuttle flight, NASA's STS-135 mission aboard Atlantis , will land Thursday (July 21) to cap a 13-day trip that delivered supplies and spare parts to the International Space Station
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