spacex falcon 9 demo 2 crew dragon launchSteve Nesius/Reuters

SpaceX’s historic first launch of NASA astronauts was scrubbed on Wednesday because of poor weather and rescheduled for Saturday, which has a similar weather forecast.
The weather might have cleared up in just 10 to 20 minutes, but the Falcon 9 rocket’s launch couldn’t wait another second.
That’s because the rocket’s ultracold fuel warms up and vents out as it sits on the launch pad, causing the machine to have less room for error in sending people to orbit.
When a Crew Dragon spaceship is on top with passengers inside, the rocket must lift off 35 minutes after fueling begins — and align perfectly with the International Space Station flying overhead.
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SpaceX on Wednesday pressed to kick off an historic space mission from Cape Canaveral, Florida: the rocket company’s first with human passengers.

If successful, the high-stakes demonstration flight, called Demo-2, would resurrect human spaceflight in America and ignite a new era of commercial space exploration.See the rest of the story at Business Insider

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