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The launch window is scheduled to open within the hour at 11 PM ET / 8 PM PT, and as usual, will be live streamed. The booster SpaceX is using has already flown twice, highlighting the Falcon 9's reusable capabilities, and it's scheduled to once again land on a droneship at sea after the launch.
The window for launch is open until midnight ET, and if the launch doesn't occur for some reason, the same window will be available on Thursday evening. At last check, all systems and weather were go, you can expect the live stream to begin at around 10:45 PM ET.
Update: Just as the stream came on around 10:45 PM, SpaceX announced tonight's launch has been scrubbed due to upper level winds. As mentioned above, there is a backup window for Thursday night between 10:30 PM ET and midnight.
Starlink mission will be heaviest @SpaceX payload ever at 18.5 tons. If all goes well, each launch of 60 satellites will generate more power than Space Station & deliver 1 terabit of bandwidth to Earth.
— Elon Musk (@elonmusk) May 16, 2019
New T-0 of 11:00 p.m. EDT—Falcon 9 and Starlink continue to look good for today's launch
— SpaceX (@SpaceX) May 16, 2019