NASA plans to open a competition in December for multiple, 30-month contracts to study strap-on booster upgrades for the planned heavy-lift Space Launch System (SLS), including an upgrade for the five-segment, solid-fuel strap-ons baselined as the initial boosters for the big new rocket. One challenge for NASA engineers will be to design an interface that can link different booster types to the SLS core stage, according to William Gerstenmaier, associate administrator for human ...


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