With an instantaneous launch window that opens and closes at 4:43pm ET (9:43pm BST) today, SpaceX will attempt to send its Falcon 9 rocket and Dragon spacecraft soaring into space.
While there is some intriguing cargo aboard the Dragon spacecraft, notably the expandable Bigelow habitation module, most of today's suspense will come after launch when SpaceX attempts to land its first stage booster on a drone ship off the Florida coast.
According to today's flight profile, the first stage main engines will cutoff at 2 minutes, 30 seconds after launch. The main engines will separate about 4 seconds later, and the first stage boostback burn will begin 4 minutes after launch. The landing burn should occur at 8 minutes, followed by an experimental landing attempt at around 10 minutes.
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