When the countdown to its launch ended early Saturday morning, Dragon, the first private spacecraft to ever attempt docking with the international space station, did not take off.

“Early data indicates that the flight computer detected slightly high combustion chamber pressure on engine 5, which prompted the computer to abort the countdown,” wrote Space Exploration Technologies (SpaceX), the spaceflight company that attempted the launch, in a statement.

To put the unmanned Dragon into an orbit where it can dock with the international space station, SpaceX must launch it within a narrow timeframe. As soon as its computers automatically shut down the... 

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