SpaceX and NASA complete historic launch successfully
By Jackie Wattles, CNN Business
Updated 7:23 PM ET, Sat May 30, 2020
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4:25 p.m. ET, May 30, 2020
Astronauts say their goodbyes before liftoff
From CNN Business' Jackie Wattles
The astronauts on board Crew Dragon just shared a final exchange with mission control:
Mission control: "Know that we’re with you, have an amazing flight, and enjoy those views of our amazing planet."
Crew Dragon: "It is absolutely our honor to be part of this huge effort to put the United States back in the launch business. We’ll talk to you from orbit, thank you."
3:21 p.m. ET, May 30, 2020
Last steps to liftoff
From CNN Business' Jackie Wattles
SpaceX is almost done loading the fuel onto the rocket.
Not many checks or milestones remain before liftoff.
At Kennedy Space Center, the nerves are palpable at the press site.
After spending much of the day wondering if the weather would dash another day of preparations, the latest updates have given today's mission a new sense of reality.
The countdown clock has already passed the mark where it stopped at on Wednesday.
6:36 p.m. ET, May 30, 2020
SpaceX chief operating officer Gwynne Shotwell
From CNN Business' Jackie Wattles
SpaceX COO Gwynne Shotwell made her first appearance on the NASA-SpaceX webcast.
Shotwell, one of the first dozen employees to join the company, handles most of SpaceX's day-to-day operations.
"I stopped getting nervous for launches — today I'm nervous again. Stomach in throat."
3:22 p.m. ET, May 30, 2020
Weather isn't in the clear quite yet: 70% chance of liftoff
From CNN Business' Jackie Wattles
The "go/no-go" poll involves several check-ins among flight controllers, weather officials and mission control.
And during the first poll, which happened about 45 minutes left on the countdown clock, weather officials gave the answer everyone wanted to hear: The forecast is looking good right now.
But things can still change. If at any time, the weather shifts and violates some of the pre-set rules for conditions, the launch could be called off.
Officials will continue monitoring the weather closely until about a minute before liftoff, when the rocket's automated computers take over.
Hear more:
3:22 p.m. ET, May 30, 2020
Fueling has begun: About 30 minutes to liftoff
From CNN Business' Jackie Wattles
SpaceX's Falcon 9 rocket is now being loaded up with more than 1 million pounds of fuel.
The rocket uses two types of fuel: RP-1 (or "Rocket Propellant 1, a type of refined kerosene) and LOX (or liquid oxygen) — which serves as an oxidizer to keep the engine burning after liftoff.
LOX is made of oxygen made so cold it turns liquid, and after it's loaded, viewers will be able to see what looks like steam or smoke emanating from the rocket. That's just the super-chilled oxygen boiling off the side of the rocket as the surrounding air heats some of the excess LOX.
3:22 p.m. ET, May 30, 2020
Crew Dragon abort system is armed
From CNN Business' Jackie Wattles
The abort system is now armed on Crew Dragon, which means that if anything goes wrong with the rocket from now on, astronauts Bob Bhenken and Doug Hurley will be able to make an extremely speedy exit.
Crew Dragon is equipped with special engines — called Super Draco thrusters — that are designed to blast the crew capsule away from a malfunctioning rocket, taking the astronauts to safety.
That special capability is one reason why NASA says SpaceX's Crew Dragon spacecraft is much safer than its predecessor — the Space Shuttle.
2:44 p.m. ET, May 30, 2020
Weather is: GO!
From CNN Business' Jackie Wattles
Mother Nature appears to be on SpaceX's side today.
The launch teams just finished the initial "go/no-go" poll, and it's all systems go.
There was questionable weather earlier in the day. But as the launch controllers checked in before fueling the rocket, weather officials said they were in the clear.
"We've been waiting for those words since Wednesday."
SpaceX's John Insprucker said they remain cautiously optimistic that conditions will remain acceptable all the way to launch time.
The chance of a weather scrub is also much better at 30%. Earlier in the day, weather officials had given a 50-50 probability.
2:32 p.m. ET, May 30, 2020
The astronauts are ready. The rocket is ready. But is the weather?
From CNN Business' Jackie Wattles
"We're optimistic right now. Conditions have been improving."
The astronauts said they are "go" for launch. And all the technical checks went smoothly this afternoon.
The big question is still whether the weather will hold up, and the latest update is expected in just a few minutes.
The NASA and SpaceX teams will have to decide, based on how the whether looks now, whether to move forward with fueling the rocket.
2:10 p.m. ET, May 30, 2020
Meet Carol Scott: NASA's risk expert
From CNN Business' Jackie Wattles
Carol Scott helped NASA assess what went wrong — and heal from — two tragic accidents during the Space Shuttle program.
But these days, she's the manager of the Launch Vehicle Office of NASA’s Commercial Crew Program — and that means she and her team were essential in determining that SpaceX's Crew Dragon capsule is ready for this mission and that the unavoidable risks were mitigated.
That's not an easy gig.
"I'm not sleeping right, because I've got enough anxiety going on," she joked during an interview with CNN Business on Tuesday. "But if I didn't have butterflies, that would not be right."
SpaceX's Crew Dragon capsule is unique: The company handled design and development, though NASA still provides critical safety oversight. Scott's team numbered in the thousands when she worked on the Space Shuttle program. But her team now numbers in the hundreds.
Still, Scott has never been more confident, she said.
The [SpaceX] system is definitely much safer than the Shuttle — for lots of reasons."
For one thing, the Shuttle required astronauts to strap into the giant white spaceplane, which was vertically attached to rocket boosters on the launch pad. But for this mission, the astronauts will sit tight in the Crew Dragon capsule, which sits atop one large rocket.
With the Space Shuttle, "a piece of foam came off and hit the orbiter," causing the catastrophic destruction of the Columbia orbiter in 2003. "But if you have a capsule on top — hey, the only thing that's gonna hit is a raindrop."