Bezos’ space company Blue Origin started at about the same time as Musk’s SpaceX but since then Musk’s firm has launched more than 400 of its Falcon 9 rockets into orbit and is testing out its giant Starship rocket which it hopes will send astronauts to the Moon and one day possibly on to Mars.

The 320-foot (98-meter) New Glenn rocket was supposed to blast off before dawn Monday with a prototype satellite. But ice formed in a purge line for a unit powering some of the rocket’s hydraulic systems and launch controllers ran out of time to clear it, according to the company.

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.