NASA has canceled an over-budget, behind-schedule mission to demonstrate robotic satellite servicing technology in orbit, pulling the plug on a project that has cost $1.5 billion and probably would have cost nearly $1 billion more to get to the launch pad.
The mission's original scope called for just the refueling demonstration, but in 2020, officials tacked on the in-orbit assembly objective. This involved adding a complex piece of equipment called the Space Infrastructure Dexterous Robot (SPIDER) essentially a 16-foot-long (5-meter) robotic arm.
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