NASA drops ISS cargo guarantee, forcing Sierra Space to pivot
When Sierra Space won a contract to deliver cargo to the International Space Station nearly a decade ago, the company promised a first for the commercial space market: a privately built, rapid reuse and cargo return spaceplane capable of landing on commercial runways. That dream has changed. In a modification to the contract announced earlier this week, NASA and Sierra Space agreed to remove the agency’s guarantee to purchase cargo flights to the ISS. Instead, the Dream Chaser spaceplane will d