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To power its rocket of the future, NASA turns to 1950s technology

For at least the first, uncrewed flight in 2018, NASA will use an interim upper stage.But Congress has been pressing the agency to settle on a new, permanent upper stage, dubbed the "Exploration Upper Stage," in time for the second launch of the SLS rocket in 2022 or 2023.

Watch live: SpaceX to launch, hopefully land its rocket today

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.According to today's flight profile, the first stage main engines will cutoff at 2 minutes, 30 seconds after launch.