NASA and Boeing are negotiating a contract worth up to about $2 billion to begin production of a third Space Launch System (SLS) core stage and order long-lead items for additional boosters. The agreement, announced Oct. 16, follows an initial contract for Boeing to produce two SLS cores for a pair of flight tests, the first of which is now not expected to take place until 2021—a delay of more than three years.  Boeing’s first SLS contract, currently worth $6.2 billion, is ...


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