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The Pegasus is an air-launched rocket developed by Orbital ATK, formerly Orbital Sciences Corporation. Capable of carrying small payloads of up to 443 kilograms into low Earth orbit, Pegasus first flew in 1990 and remains active as of 2016. The vehicle consists of three solid propellant stages and an optional monopropellant fourth stage. Pegasus is released from its carrier aircraft at approximately 12,000 m, and its first stage has wings and a tail to provide lift and attitude control while in the atmosphere.