The company, started by the Amazon founder Jeff Bezos, reset its countdown clock repeatedly over a period of just over two hours before eventually postponing the test flight to another day.

Blue Origin made two adjustments in quick succession to its schedule for launching its New Glenn rocket to orbit for the first time.

The uncrewed New Glenn rocket took off at 2:03 a.m. EST from Complex 36 at Cape Canaveral Space Force Station, Blue Origin said.