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SpaceX launches 10 satellites for Iridium on used rocket

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US private spaceflight company SpaceX launched 10 communications satellites into orbit for Iridium Communications on a used Falcon 9 rocket from California on Friday.

A SpaceX Falcon 9 rocket blasted off from Space Launch Complex 4E (SLC-4E) at Vandenberg Air Force Base in California at 7:13 a.m. PDT, carrying 10 satellites for Iridium Communications, as part of the company's Iridium Next constellation.

The satellites began deployment about an hour after launch. A successful deployment of all 10 satellites was confirmed about one hour and 12 minutes after the liftoff.

"Successful deployment of all 10 @IridiumComm NEXT satellites to low-Earth orbit confirmed," the Hawthorne, California-based company tweeted.

SpaceX has been reusing Falcon 9 first stages and is pursuing fully reusable rockets in an effort to lower the cost of spaceflight. However, the company didn't attempt to recover Falcon 9's first stage after Friday's launch.

The first stage of Falcon 9 for the Iridium-5 mission previously supported the Iridium-3 mission from SLC-4E in October 2017.

Friday's mission, called Iridium-5, is the fifth set of 10 satellites in a series of 75 total satellites that SpaceX will launch for Iridium's next generation global satellite constellation, Iridium NEXT.

When complete, the constellation will consist of 66 operational satellites and nine spares in orbit. SpaceX has launched the first four missions, totaling 40 satellites, in 2017.

The company plans to have a total of 75 satellites launched into orbit by mid-2018.

Iridium is so far the only mobile voice and data satellite communications network that spans the entire globe, including across oceans, airways and polar regions.

According to the company, it is on track to fully replace the world's largest commercial satellite network of low-Earth orbit satellites in what will be one of the largest "tech upgrades" in history.

The satellite communications company has partnered with Thales Alenia Space for the manufacturing, assembling and testing of 81 Iridium NEXT satellites.

Iridium's next-generation global satellite constellation will deploy a cross-linked low-Earth orbit architecture, covering 100 percent of the Earth's surface. The process of replacing the satellites one by one in a constellation of this size and scale has never been completed before.

SpaceX initially aimed to launch the Iridium-5 mission Thursday, but a technical glitch with one of the satellites forced a delay.

Friday's launch is one of two missions in four days for SpaceX. Another used Falcon 9 rocket will launch an uncrewed Dragon cargo ship, which has also flown previously, to deliver cargo to the International Space Station.

The US National Aeronautics and Space Administration (NASA) cargo mission is scheduled to launch on Monday from Cape Canaveral Air Force Station in Florida, with Dragon arriving at the space station next week.

Under an agreement with NASA, SpaceX is now developing the refinements that will enable Dragon to fly crew. Dragon's first manned test flight is expected to take place as early as 2018, according to SpaceX.

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