FAA grounds SpaceX’s largest rocket yet after its booster experienced anomalies during a test flight this month. Credit: SpaceX After completing what it said was a “thorough assessment,” the FAA on Wednesday ordered SpaceX to investigate anomalies that its Super Heavy booster experienced during the  12th test flight  of its behemoth Starship rocket. The aviation regulator on Tuesday was ambiguous about whether an investigation would be required into Starship Flight 12, which launched Friday evening from SpaceX’s Starbase facility in Texas. Now, it is grounding the largest rocket ever constructed until the company determines what prevented multiple engines from lighting during a planned Super Heavy flip and boostback maneuver. Super Heavy, powered by 33 Raptor engines, is the vehicle that boosts Starship to suborbit, the highest altitude it has reached in flight testing. Stacked together, the spacecraft stand more than 400 feet (122 meters) tall, or nearly the length of a Boeing 777.…