The Pegasus rocket is a space launch device developed by Orbital. The Pegasus is launched from the air, strapped to the belly of a jet airplane. The Pegasus can carry payloads of up to 1,000 pounds.Spaceflight Now: The Pegasus rocket
On October 19, 2008, a Pegasus rocket launched the IBEX probe into space. The probe will remain in earth orbit and measure the solar wind at the furthest edges of space.NASA: Ibex is in orbit! (October 19. 2008)