SpaceX postpones launch to switch astronauts at the International Space Station.
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SpaceX delayed a rocket launch to the space station. There was a problem with the rocket's support system.
The rocket needs to release before it goes up. Engineers worked to fix the problem before launch.
Four astronauts were already in the rocket, waiting. The launch was postponed until Friday at least.
Two astronauts are already at the space station. The new crew will replace them after nine months.
The original plan was to use a different capsule. Problems with that capsule caused a change of plans.
Questions
Why was the SpaceX rocket launch delayed?
There was a problem with the rocket's support system.
How many astronauts were waiting in the rocket?
Four astronauts were already in the rocket, waiting.
What was the original plan for the launch?
The original plan was to use a different capsule.
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