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VANDENBERG AIR FORCE BASE, Calif. – On the ramp of Vandenberg Air Force Base in California, a Pathfinder aircraft waits for its passengers to arrive before takeoff. The Pathfinder will accompany Orbital Sciences’ L-1011 aircraft carrying NASA’s Interstellar Boundary Explorer, or IBEX, spacecraft and Pegasus XL rocket on its flight to the Kwajalein Atoll, a part of the Marshall Islands in the Pacific Ocean. The Pathfinder will carry the contingency crew and launch team members. Departing from Kwajalein, the Pegasus rocket will be dropped from under the wing of the L-1011 over the Pacific Ocean to carry the spacecraft approximately 130 miles above Earth and place it in orbit. Then, the spacecraft’s own engine will boost it to its final high-altitude orbit (about 200,000 miles high) — most of the way to the Moon. The IBEX satellite will make the first map of the boundary between the Solar System and interstellar space. IBEX science will be led by the Southwest Research Institute of San Antonio, Texas. IBEX is targeted for launch over the Pacific Oct. 19. Photo credit: NASA/CIV USAF/Daniel Liberotti