First Stage
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First Stage

January 7, 2010
The launch vehicle's first stage is a single, five-segment reusable solid rocket booster, derived from the Space Shuttle Program's four-segment reusable solid rocket booster, which burns a specifically formulated and shaped solid propellant called polybutadiene acrylonitrile (PBAN). A newly designed forward adapter will mate the vehicle's first stage to the second, and will be equipped with booster separation motors to disconnect the stages during ascent.

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