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'''STS-93''' in 1999 marked the 95th launch of the [[Space Shuttle]], the 26th launch of [[Space Shuttle Columbia|''Columbia'']], and the 21st night launch of a Space Shuttle. [[Eileen Collins]] became the first female shuttle Commander on this flight. Its primary payload was the [[Chandra X-ray Observatory]]. It would also be the last mission of ''Columbia'' until March 2002. During the interim, ''Columbia'' would be out of service for upgrading, and would not fly again until [[STS-109]]. The launch was originally scheduled for 20 July but the launch was aborted at T−7 seconds. The successful launch of the flight occurred 3 days later. The payload was also the heaviest payload ever carried by the Space Shuttle system, at over 22.7 tonnes (25 tons).<ref>{{Cite web |url=http://www.cnn.com/TECH/space/9907/23/shuttle.04/ |title=Shuttle releases heaviest payload ever |date=July 23, 1999 |website=www.cnn.com |access-date=2018-08-28}}</ref><ref>{{Cite web |url=http://www.guinnessworldrecords.com/world-records/heaviest-payload-launched-shuttle |title=Heaviest payload launched - shuttle |website=Guinness World Records |language=en-GB |access-date=2018-08-28}}</ref>
==Crew==
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