SpaceX Successfully Launches Expendable Falcon 9 Rocket, Delivers Its Biggest Payload Yet

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Miss Monday night's launch from Kennedy Space Center?

Watch the launch of a SpaceX Falcon 9 rocket carrying an INMARSAT-5 satellite live online.

The satellite is meant to provide additional high-speed broadband capacity for users of London-based satellite communications firm Inmarsat's Global Xpress network.

In just a few hours, SpaceX will launch its sixth Falcon 9 rocket this year.

Inmarsat, which is flying for the first time with SpaceX, had hoped to have its $250 million F4 satellite in orbit past year, but the flight was delayed after a Falcon 9 exploded on the launch pad as it was being fueled for a preflight engine test on September 1.

Instead, the spent rocket will fall into the Atlantic Ocean, as numerous rocket boosters did before SpaceX and others like Jeff Bezos' Blue Origin led the charge toward reusable rockets.

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The launch weather forecast looks good, with an 80 percent chance of favorable conditions during a 49-minute window at KSC's pad 39A. We'll update this story when they return to broadcasting to let you know if the post-launch mission was a success as well. The Elon-Musk-founded company will send a communications satellite into orbit for Inmarsat.

The Inmarsat-5 F4 satellite was placed into a geostationary transfer orbit; from there it will eventually move into its permanent position 22,236 miles over Earth.

The launch is another milestone for SpaceX - it's the second launch in only fourteen days from Launch Complex 39A, part of SpaceX's ambitious launch schedule of sending payloads into orbit every two weeks. A later engine burn successfully put Inmarsat-5 F4 into its proper orbit for spacecraft separation.

This particular satellite is one of the heaviest SpaceX has put into the sky. Inmarsat has an option for another future flight with SpaceX.

The Inmarsat-5 series of satellite is built on the Boeing 702HP satellite bus. The first three satellites were launched by Russian Proton rockets in 2013 and 2015.

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