When did spaceflight officially resume after NASA grounded the shuttle fleet following the Challenger disaster?
Answer
September 1988
The Space Shuttle program was immediately grounded following the Challenger disaster in January 1986, halting all missions for more than two years while NASA addressed redesigns for the solid boosters and implemented substantial administrative safety changes. Spaceflight ultimately resumed in September 1988. The mission that marked this resumption was successfully carried out by the orbiter Discovery, signaling the beginning of a subtly altered operational mandate for the remaining shuttle fleet.
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