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SpaceX postpones Starlink launch from Florida

A SpaceX Falcon 9 rocket with the company’s Crew Dragon spacecraft onboard is seen as it is raised into a vertical position on the launch pad at Launch Complex 39A as preparations continue for the Demo-2 mission, Thursday, May 21, 2020, at NASA’s Kennedy Space Center in Florida. NASA’s SpaceX Demo-2 mission is the first launch with astronauts of the SpaceX Crew Dragon spacecraft and Falcon 9 rocket to the International Space Station as part of the agency’s Commercial Crew Program. The flight test will serve as an end-to-end demonstration of SpaceX’s crew transportation system. Behnken and Hurley are scheduled to launch at 4:33 p.m. EDT on Wednesday, May 27, from Launch Complex 39A at the Kennedy Space Center. A new era of human spaceflight is set to begin as American astronauts once again launch on an American rocket from American soil to low-Earth orbit for the first time since the conclusion of the Space Shuttle Program in 2011. Photo Credit: (NASA/Bill Ingalls)

SpaceX postponed its 13th launch cluster of Starlink communications satellites Thursday, citing a “recovery issue.”

The launch aboard a Falcon 9 rocket had been planned for 2:19 p.m. EDT from Complex 39A at Kennedy Space Center. It was called off about 2 p.m.

Although the company didn’t elaborate on the specific cause of the delay, SpaceX had planned to recover the first-stage rocket booster on a ship in the Atlantic Ocean.

The launch has been rescheduled for 1:57 p.m. EDT Friday, but a Space Force forcast predicts a 70 percent chance of unfavorable weather.

A successful launch of the 60 spacecraft would bring the total in space to more than 700.

“SpaceX has launched over 700 Starlinks, but 27 of them already have come down,” Jonathan McDowell, an astronomer at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., said Wednesday.

McDowell tracks the satellites based on data that SpaceX makes public.

One of the satellites failed, but the others were brought down intentionally as SpaceX apparently sent them a deorbit signal, McDowell said.

Such a deorbit causes the craft to fire thrusters and move down into the atmosphere within 30 minutes. If the satellite fails or malfunctions, the descent can take hours or days, he said.

SpaceX described the first batch of 60 that it launched in May 2019 as Version 0.9, and they would be used to test aspects of the system. According to McDowell, those satellites make up the bulk of the deorbits, so they may have been viewed as disposable from the start.

The space company has said the full lifespan of the craft is about five years.

“If SpaceX and other companies intend to launch thousands of these broadband satellites, there will be a continuing rain of spacecraft in the future,” McDowell said.

While the company increases the number of spacecraft in orbit, it also is testing the system with hundreds of users in North America, according to documents SpaceX has filed with the Federal Communications Commission.

The service has “super-low latency and download speeds greater than 100 Mbps” megabits per second, Kate Tice, a senior program reliability engineer at SpaceX, said during a Starlink launch Sept. 3.

Such speeds are considered sufficient for multiplayer gaming, and SpaceX recently described the speed in a tweet as “fast enough to stream multiple HD movies at once and still have bandwidth to spare.”

Users testing the system have dish-shaped antennas that look like a “UFO on a stick” according to SpaceX founder and CEO Elon Musk.

“The Starlink team has been collecting latency statistics and performing standard speed tests of the system,” Tice said. “This means that we’re checking how fast data travels from the satellites to our customers, and then back to the rest of the Internet. Initial results have been good.”

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