Federal regulators have closed an investigation into what went wrong when a SpaceX Starship spacecraft — part of the most powerful launch system ever constructed — exploded during a January test flight.

The Federal Aviation Administration said on Friday it cleared the SpaceX Starship vehicle to return to flight operations while an investigation into the January 16 Starship Flight 7 mishap remains open.

SpaceX has pushed the eighth test flight of its Starship megarocket back a few days. Elon Musk's company had been targeting Friday (Feb. 28) for Flight 8 of Starship, the biggest and most powerful rocket ever built.