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A military satellite launched by Elon Musk’s Space Exploration Technologies Corp. hasn’t been spotted in orbit by the U.S. Strategic Command, creating a mystery about the fate of the classified payload and doubts about whether the mission was a success.

The mission — referred to by the code name Zuma — took off from Cape Canaveral Air Force Station in Florida Sunday on a SpaceX Falcon 9 rocket. But the Strategic Command, which monitors more than 23,000 man-made objects in space, said it is not tracking any new satellites since the launch.

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“We have nothing to add to the satellite catalog at this time,” Navy Captain Brook DeWalt, a spokesman for the command, said in an email when asked if the new satellite was in orbit.

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A U.S. official and two congressional aides, all familiar with the launch, said on condition of anonymity that the second-stage of SpaceX’s Falcon 9 booster rocket failed. The satellite was lost, one of the congressional aides said, and the other said both the satellite and the second-stage satellite fell into the ocean after the failure.