SpaceX launched a load of supplies to the International Space Station on Saturday May 4th following a pair of unusual power delays.
A Falcon rocket raced into the pre-dawn darkness, carrying a Dragon capsule with 5,500 pounds (2,500 kilograms) of goods. This recycled Dragon, which is making its second space trip, is due to arrive at the orbiting lab on Monday May 6th.
The booster, meanwhile, streaked to a smooth landing on a recovery ship just offshore.
SpaceX was unable to resist the Star Wars Day (May 4th) connection.
"Dragon is now officially on the way to the space station," the SpaceX launch commentator announced once the capsule reached orbit and its solar wings unfurled. "Until next time, May the Fourth be with you."
According to AP, the delivery is a few days late because of electrical power shortages that cropped up first at the space station, then at SpaceX's rocket-landing platform in the Atlantic.
Both problems were quickly resolved with equipment replacements: a power-switching unit in orbit and a generator at sea.
Minutes after lift-off, SpaceX landed its brand new, first-stage booster on the ocean platform roughly 10 miles (16 kilometres) off the coast, considerably closer than usual with the sonic booms easily heard at the launch site.
"That looked really, really cool in the night sky," said Hans Koenigsmann, a SpaceX vice president who left his launch control seat to run outside and watch.
The booster will probably be reused for SpaceX's next station supply run. That is why the company and Nasa halted Friday's countdown at the last minute, so the recovery ship could be repaired and have full power for the landing operation. It was the first time a launch like this was nixed by rocket-landing concerns.
The booster should have returned to Cape Canaveral, but SpaceX is still cleaning up from the April 20th accident that destroyed a Dragon capsule empty of crew.
Koenigsmann said earlier this week the company still does not know what caused the empty capsule to burst apart in flames on a test stand. The capsule's SuperDraco launch-abort thrusters were just a half-second from firing when the blast occurred.
This first crew capsule had completed a successful test flight, minus a crew, to the space station in March. SpaceX intended to re-fly the capsule on a launch-abort test in June, ahead of the first flight with astronauts on a new crew Dragon. The schedule is now up in the air, as SpaceX scrambles to identify and correct whatever went wrong.
SpaceX has been restocking the station since 2012.
This latest cargo Dragon — making the company's 17th shipment — is carrying equipment and experiments for the six space station astronauts, including an instrument to monitor carbon dioxide in Earth's atmosphere.
The California-based company is also under contract with Nasa, along with Boeing, to transport astronauts to the space station. It is unclear whether these commercial crew flights will begin this year, given the Dragon accident and Boeing's own delays with its Star-liner capsule.
Astronauts have not launched from Cape Canaveral since the last space shuttle mission in 2011, instead riding Russian rockets at a steep cost to Nasa.