Vehicle Assembly Building at Sunset

Kennedy Space Center and the Vehicle Assembly Building, seen at sunset on May 15, 2017.

Inmarsat5F4 Falcon9

At 7:21pm (ET) on May 15, 2017, SpaceX successfully launched the #INMARSAT5 #Inmarsat5F4 #I5F4 #Falcon9 satellite from Launch Complex 39A at NASA's Kennedy Space Center in Florida. (Photos by Michael Seeley / We Report Space)

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Inmarsat5F4 Falcon9

At 7:21pm (ET) on May 15, 2017, SpaceX successfully launched the #INMARSAT5 #Inmarsat5F4 #I5F4 #Falcon9 satellite from Launch Complex 39A at NASA's Kennedy Space Center in Florida. (Photos by Michael Seeley / We Report Space)

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Inmarsat5F4 Falcon9

The #SpaceX #INMARSAT5 #Falcon9 on the pad, ready for launch. Window opens at 7:20pm (ET) tonight. (Photo by @Mike_Seeley / @WeReportSpace )

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Inmarsat5F4 Falcon9

At 7:21pm (ET) on May 15, 2017, SpaceX successfully launched the #INMARSAT5 #Inmarsat5F4 #I5F4 #Falcon9 satellite from Launch Complex 39A at NASA's Kennedy Space Center in Florida. (Photos by Michael Seeley / We Report Space)

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Inmarsat5F4 Falcon9

At 7:21pm (ET) on May 15, 2017, SpaceX successfully launched the #INMARSAT5 #Inmarsat5F4 #I5F4 #Falcon9 satellite from Launch Complex 39A at NASA's Kennedy Space Center in Florida. (Photos by Michael Seeley / We Report Space)