Wednesday’s landing snafu involved a “block 5” Falcon 9 booster, which is designed to be re-used at least 10 times. On Dec. 3, SpaceX flew a different “block 5” rocket for the third time, landing it successfully for future re-use. As SpaceX rockets are priced starting at $60 million (though previously-flown ones retail more cheaply), the company’s inability to reuse this booster in the future could cost it millions.

The CRS-16 booster began spinning out of control toward the end of its landing pattern, just before it was expected to fire its engines to slow itself ahead of reaching the ground. It’s not known if any changes were made to this rocket compared to other block 5 boosters.

John Insprucker, the SpaceX engineer hosting the company’s live video stream, noted that the company will use the data gathered during the failed landing to iterate and improve on future vehicles.

This is the first failed landing of a Falcon 9 booster since June 2016. Since then, the company has recovered boosters 26 times in landings on autonomous drone ships and landing pads at Cape Canaveral and Vandenberg Air Force Base. While this is hardly the first time a SpaceX booster has crashed during a recovery attempt, more than two years of successful attempts made them seem routine.

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